What's wrong with dynamos?
#26
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It does seem from everyone's responses that I'm certainly not abnormal, I do have dynamos for lighting on 4 out of 5 bikes and USB charging on 2 out of the 4 (multi-day longer distance rigs). Just shocking that some people had no idea that good dynamo's and LED lighting can be had for a reasonable rate, although to several people's point building up a wheel can sometimes be expensive, but worth it IMHO.
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I thought it was a pretty damned good value before I saw the quality of the wheels. I paid $95 for a front wheel with Sanyo dynamo. But it's a truly handbuilt wheel with good and even spoke tension, totally true. I hope they can make a comeback, even if it means raising their prices.
Last edited by wsgts; 09-15-19 at 07:25 PM.
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Whoa, let's not jump to conclusions! There's just a lot of weirdos here.
#29
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So true. 200 well placed lumens on the road beat any 500 lm conical beam shape... Albeit there is some rare, reasonable priced chinese stuff with a useful reflector (i.e. at the moment Lumintop B01). All other high powered lamps which don't waste light in the tree tops are (very) expensive (Outbound Road, B&M Ixon Space, Lupine SL(F) and SL-X, Supernova M99 series)
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The less powerful argument is wrong. You can get 6-9 W electrical output from a hub dynamo, and the efficiency even increases with higher electrical load. Velogical Engineering even has a rim driven sidewall 3-phase generator, with an output of 15W at 25-30 km/h. Of course that means you have to pedal harder...
#32
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The sport version delivers a bit less power than the touring version at the identical speed, but both can easily power a 3W dynamo lamp system. Check this graph from Olaf Schultz/Andreas Oehlers data: https://fahrradzukunft.de/bilder/18/...s/12.gross.png ; it shows velocity vs delivered electrical power for the sports and touring version. The Velogical dynamos have a safety feature (PTC) which limits the power to ~3W to avoid damage on modern LED dynamo lamps. If this component is not included in the electrical circuit on the bike, the delivered power is not limited anymore.
Last edited by polyphrast; 09-16-19 at 07:51 AM.
#33
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I like the convenience of the dynamo I added to my touring bike this year. But if I'm riding in the city at night I definitely need to have a helmet light as well if I'm going to use the MUP. Visibility going into corners is an issue for any fixed light, but with the edelux-ii I quickly noticed difficultly in seeing pedestrians that are directly in front of me since all the light is aimed at their feet. In an edelux-iii I'd like to see the addition of a switch activated high beam in addition to higher output. I'm using my older 1000 lumen Dinotte XML-3 on my helmet, it runs much warmer than the 2100 lumen version I bought last year, and the light has been upgraded to 2500 lumen this year. Makes me wish I could swap out the LED emitter on my dynamo light to double its output.
#34
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The velogical rim dynamo is 165€ on ebay which seems to be their only retail outlet. How good is it compared with the alternatives? Maybe it's worth it if it is as efficient as a hub because it's lighter, and installation is easier or cheaper. You can also remove it easily.
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#35
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The velogical rim dynamo is 165€ on ebay which seems to be their only retail outlet. How good is it compared with the alternatives? Maybe it's worth it if it is as efficient as a hub because it's lighter, and installation is easier or cheaper. You can also remove it easily.
My next bike which needs a dyno gets this one !
I like the convenience of the dynamo I added to my touring bike this year. But if I'm riding in the city at night I definitely need to have a helmet light as well if I'm going to use the MUP. Visibility going into corners is an issue for any fixed light, but with the edelux-ii I quickly noticed difficultly in seeing pedestrians that are directly in front of me since all the light is aimed at their feet.
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#36
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3.5 min into this video illustrates the invisible pedestrian issue
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Regarding your title, nothing is wrong with them. But manufacturers do not install them because new buyers do not ask for them. Not even on touring bikes where a dynohub for battery charging is desired.
...
When building up a new bike with a new wheel, the cost of a dynohub and subtracting the cost of a regular hub makes the additional cost for a dynohub on the bike quite low. But if you already have a bike with a non-dynohub wheel, the cost to put a dynohub on it is the cost of the hub, cost of spokes and nipples, possibly a wheel build charge, and if you decided to keep your old wheel as a back up then you are buying new rim and rim tape too. Thus to upgrade a bike that did not have a dynohub on it, you are likely paying two or three times as much for the dynohub wheel. That is a big enough cost that not many people go for it.
...
When building up a new bike with a new wheel, the cost of a dynohub and subtracting the cost of a regular hub makes the additional cost for a dynohub on the bike quite low. But if you already have a bike with a non-dynohub wheel, the cost to put a dynohub on it is the cost of the hub, cost of spokes and nipples, possibly a wheel build charge, and if you decided to keep your old wheel as a back up then you are buying new rim and rim tape too. Thus to upgrade a bike that did not have a dynohub on it, you are likely paying two or three times as much for the dynohub wheel. That is a big enough cost that not many people go for it.
#38
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For example, high beam on (approved) bike lights is only legal since 2017...
#39
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I think this is a good perspective worth a "signal boost". IOW, if a dynohub wheel seems expensive, it's really because of the money you already sank into a non-dyno front wheel. If you plan things out better when you are spec'ing out a bike, you only have to buy one of each thing, and it's not so bad!
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That is just wrong. There are three versions of that dynamo (sports, touring, generator). The generator in combination with a mobile power supply for bikes can deliver 15W at 30 km/h. You can check it here, the green line in the graph Forumslader für Velogical: Forumslader (sorry, in german, don't know of an english test, but the graph should be self explenatory) The forumslader is a similar system as the "the plug" from tout terrain (https://www.cyclingabout.com/review-...-the-plug-iii/)
The sport version delivers a bit less power than the touring version at the identical speed, but both can easily power a 3W dynamo lamp system. Check this graph from Olaf Schultz/Andreas Oehlers data: https://fahrradzukunft.de/bilder/18/...s/12.gross.png ; it shows velocity vs delivered electrical power for the sports and touring version. The Velogical dynamos have a safety feature (PTC) which limits the power to ~3W to avoid damage on modern LED dynamo lamps. If this component is not included in the electrical circuit on the bike, the delivered power is not limited anymore.
The sport version delivers a bit less power than the touring version at the identical speed, but both can easily power a 3W dynamo lamp system. Check this graph from Olaf Schultz/Andreas Oehlers data: https://fahrradzukunft.de/bilder/18/...s/12.gross.png ; it shows velocity vs delivered electrical power for the sports and touring version. The Velogical dynamos have a safety feature (PTC) which limits the power to ~3W to avoid damage on modern LED dynamo lamps. If this component is not included in the electrical circuit on the bike, the delivered power is not limited anymore.
I'm not going to go through all of those, but generally speaking a dynamo can deliver a given power depending on how fast it turns - screaming down a hill at 50 mph for example - up to the point that it burns out, burns out a driver board, burns out a light, or suffers mechanical failure.
Show me some lumen comparisons of a rider tooling along at 12-20 mph, that would be something meaningful.
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Depends on the crowd. Some folks buy a new bike every few years, they have lots of opportunities to demand dyno lighting if they want it.
Folks who can't or won't buy more than a cheap blinkie are really out of the scope of this discussion.
Folks who can't or won't buy more than a cheap blinkie are really out of the scope of this discussion.
#42
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@ThermionicScott, yes. As one damned fool said, people in this forum are not typical.
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#43
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If I were you, I wouldn't rely on that chart to reflect power output in regular operating conditions. The first link, near as I can tell, is for a driver board (?) and apparently recommends a 3 watt limitation when used with hub dynamos.
I'm not going to go through all of those, but generally speaking a dynamo can deliver a given power depending on how fast it turns - screaming down a hill at 50 mph for example - up to the point that it burns out, burns out a driver board, burns out a light, or suffers mechanical failure.
I'm not going to go through all of those, but generally speaking a dynamo can deliver a given power depending on how fast it turns - screaming down a hill at 50 mph for example - up to the point that it burns out, burns out a driver board, burns out a light, or suffers mechanical failure.
As said, there are two other versions (2phase), which deliver less power, but those still need to be used with an included power limiter to avoid damage to the bike lamp. They deliver 3 W from 15 km/h (~10 mph) on, so at any speed above the ydeliver more.
And i sincerly doubt that a hub dynamo will burn out at 50 mph. The connected electronics (if not equiped with a protection circuit), but not the dynamo. Hub dynamos (to my knowledge) do not include electronics, only magnets and a few wires.
Of course it's easier and simpler to get a bike light operated with a battery to start riding. The generator needs some suitable electronics to deliver constant voltage for a bike light. I only want to point out that electrical output limitation is not an issue of modern generators. Any hub dynamo is a constant current source, so at 12 V the output doubles (and the efficiency increases).
Last edited by polyphrast; 09-16-19 at 12:39 PM.
#44
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So true. 200 well placed lumens on the road beat any 500 lm conical beam shape... Albeit there is some rare, reasonable priced chinese stuff with a useful reflector (i.e. at the moment Lumintop B01). All other high powered lamps which don't waste light in the tree tops are (very) expensive (Outbound Road, B&M Ixon Space, Lupine SL(F) and SL-X, Supernova M99 series)
To put it another way, to put light into the “tree tops” with a 35° reflector would have to be 200 feet away from that tree. Light that far away would be mostly useless, of course, and most people aren’t going to aim their lights like that.
I have a dynohub on all of my bikes. It was a great addition to my riding, i don't have to worry about getting home before dark or charging lights. I always had a bike with a dyno back in the '70s and '80s. One of the Soubetez with a built in headlight. They weren't as expensive as batteries back then, this was before the advent of affordable rechargeable batteries
It does seem from everyone's responses that I'm certainly not abnormal, I do have dynamos for lighting on 4 out of 5 bikes and USB charging on 2 out of the 4 (multi-day longer distance rigs). Just shocking that some people had no idea that good dynamo's and LED lighting can be had for a reasonable rate, although to several people's point building up a wheel can sometimes be expensive, but worth it IMHO.
...and I get a single light per bicycle. With batteries, I have 3 lights with which to see the road and be seen for about 1/15 the cost.
That’s the reason that people have embraced batteries over dynamos. Less cost, more flexibility and more light.
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#45
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And i personally do not like the brightest spot of a bike light 30 ft in front of the bike (if i understood your bike lamp adjustment correctly). I want to see in the distance, and therefore the brightest spot of the light must not be 30 ft in front of the bike, it should be further in the distance. But, needs and tastes differ. I tried conical beam shapes, but i prefer other light designs. Living at the other side of the big pond, i am of the opinion that a conical beam shape on a bike light is a big no-go unless you ride where you never encounter other people. It's even a law here. Not in the states, so you have a different legal situation.
I'd say you're an rare exception having 8 bikes, of which you ride 5 regularly at night. Bike lights for dedicated night rides are a different matter than lights for the above mentioned riding/commuting/ every-day-use profile. Had i 5 bikes to choose from for a night ride, i'd also simply get a proper battery powered lamp for those and still a dyno setup for my every-day-use bike (my city/touring bike is equipped with a hub dynamo system, by cyclocross bike is equipped with battery powered light). Most battery light users have far less bikes which they use at night.
#46
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"tree tops" was of course an exaggeration. i meant any light above 15 feet. For my riding situations, any light (except a bit of scattered light) at these heights is simply wasted and a properly designed beam pattern focused on the path/road/MUP is much more useful. Even for situations where a "high beam" is needed, illumination up to 10-15 ft is completely sufficient. Of course if you speed along a narrow trail in the woods and/or mountains with lots of climbs and very fast and step descents at night, things are a bit different. My statement (and probably unterhausen's as well) is limited to city bikes, touring bikes and commuter bikes. So for situations where you encounter regularly oncoming traffic and pedestrians. And for those application this statement is true. Albeit there might be situations where the dyno powered light doesn't provide enough output, but in these situations conical beam shapes aren't useful either, because you either blind others or you won't have much reach with the light.
A 35° reflector would project a cone 15 feet tall at 75 feet or about about 5 car lengths. I’ve never seen anyone riding with their lights of any kind...dynamo or battery....aimed 75 feet in front of them. The further out the light is aimed, the less effective it is because the “lux” or lumen per area drops significantly as the area of the cone increases. For example (switching to meters here) the area of a 2.2m tall cone with a 25m distance from a 35° reflector would be 170 sq. meters. Using the same reflector but shortening the distance to about 10 m (two car lengths), the area drops to 30 sq meters and the height of the beam is just slightly less then 2 meters (6 feet). Assuming a 500 lumen light, the lux (or light density) of the former is 3 lumens per square meter and for the latter it is 16 lux. Neither is all that bright but 16 lux is far superior to 3.
Additionally, the lux argument goes against your (and others) “dazzling” argument. A 35° beam spreads the light out quite a bit. A wide beam isn’t going to “blind” someone because of this. A narrow beam concentrates more light in a smaller area but the smaller area means that it’s less likely to spread out and “blind” someone. I don’t, as a rule, ride on MUPs at night. It’s illegal on most of the paths I use because of night time restrictions but I also avoid riding there because pedestrians use the ones that are open and they don’t use lights. I ride roads in the night and I’m also not worried about people in cars. Again, the optics are against me causing a problem for a motorist.
And i personally do not like the brightest spot of a bike light 30 ft in front of the bike (if i understood your bike lamp adjustment correctly). I want to see in the distance, and therefore the brightest spot of the light must not be 30 ft in front of the bike, it should be further in the distance. But, needs and tastes differ. I tried conical beam shapes, but i prefer other light designs. Living at the other side of the big pond, i am of the opinion that a conical beam shape on a bike light is a big no-go unless you ride where you never encounter other people. It's even a law here. Not in the states, so you have a different legal situation.
You might want to go look at how far out 30ft (10m) is. It’s 2 carlengths. Most everyone I see are will within that range since there is no need to shoot (a lot of) light out further. The laws in my state says that my lights have to be visible from a distance of 500 feet but it doesn’t say that I have to illuminate something from that distance. Cars are under the same requirement but that doesn’t mean that the lights are aimed 500 feet in front of the car. Car lights range from 20 m to 30 m. That’s not too far out in front of the vehicle for something capable of doing much higher speeds then bicycles commonly do.
I'd say you're an rare exception having 8 bikes, of which you ride 5 regularly at night. Bike lights for dedicated night rides are a different matter than lights for the above mentioned riding/commuting/ every-day-use profile. Had i 5 bikes to choose from for a night ride, i'd also simply get a proper battery powered lamp for those and still a dyno setup for my every-day-use bike (my city/touring bike is equipped with a hub dynamo system, by cyclocross bike is equipped with battery powered light). Most battery light users have far less bikes which they use at night.
Others here have said they have a similar number of bikes. But why would I duplicate effort? I can very easily switch between bicycles without having to have a dedicated light system for a bike or even multiple bikes. Dynamo systems require dedicated wiring and lights that are usually fastened to the bike. Battery lights are much more convenient in that respect.
Additionally, I have multiple lights that can be used redundantly if something goes wrong.
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Picking the Scablands. Washington and Oregon, 2005. Pie and spiders on the Columbia River!
Last edited by cyccommute; 09-17-19 at 01:52 PM.
#47
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Others here have said they have a similar number of bikes. But why would I duplicate effort? I can very easily switch between bicycles without having to have a dedicated light system for a bike or even multiple bikes. Dynamo systems require dedicated wiring and lights that are usually fastened to the bike. Battery lights are much more convenient in that respect.
Second, i think you didn't read my former post properly. I stated that i would as well buy a battery lamp in case i had 5 bikes that i'd use regularly at night. And still i would equip my every-day-use bike with a dynamo. And still my pro's for a dynamo from post 19 are valid. I see every day people at night without dynamo light systems, who mostly forgot their bike lights, because they "didn't plan to ride so late" or "forgot to charge their lights" or "forgot the lights". This wouldn't happen with a dynamo system. If you are organized well enough to avoid this, congratulations! However too many people aren't, unfortunately. I'd probably end up without a light at night on my city bike more often than i'd like (because "life happens while you're busy making other plans")
Were my car's dipped beam only able to illuminate 30 m, i'd never drive at night. Luckily it reaches 50-60m, but even that is way too little for 70 mph. But on a car you can either use the high beam or you have enough cars in front of you that illuminate the road further in the distance.
First, the exaggeration is often used not as an exaggeration but as a statement of fact. But, again, the optics don’t match even for 15feet. To throw a 15 foot tall beam of light “into the trees” at 30 feet would require a reflector of 87°.[...] Additionally, the lux argument goes against your (and others) “dazzling” argument.[....] I ride roads in the night and I’m also not worried about people in cars. Again, the optics are against me causing a problem for a motorist.
Last edited by polyphrast; 09-17-19 at 05:15 PM.
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Agree. The vast majority of bike owners buy what the manufacturer decided should be on that bike for that given year. And sometimes the manufacturer had issues besides what would serve the customers needs best.
I am in a small minority because I built up most of my bikes from the frame and that included building the wheels. Another small minority bought custom bikes to be built to specification from a custom builder like Co-Motion or Rodriguez, etc. And another small minority hired a local bike shop to build up a custom bike based on a specific frame. Some of the buyers of custom bikes are knowledgeable about what they want but some of them are not.
I am in a small minority because I built up most of my bikes from the frame and that included building the wheels. Another small minority bought custom bikes to be built to specification from a custom builder like Co-Motion or Rodriguez, etc. And another small minority hired a local bike shop to build up a custom bike based on a specific frame. Some of the buyers of custom bikes are knowledgeable about what they want but some of them are not.
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At first, the users registered here (and especially those more active) are most probably not the "average biker joe" . Or as "noglider" wrote "people in this forum are not typical" (see signature of post 42). I was talking about the average biker joe, and this guy does not have 8 bikes, even though some other freaks here have as many bikes as you (i am freak myself but not with respect to the number of bikes ).
Second, i think you didn't read my former post properly. I stated that i would as well buy a battery lamp in case i had 5 bikes that i'd use regularly at night. And still i would equip my every-day-use bike with a dynamo. And still my pro's for a dynamo from post 19 are valid. I see every day people at night without dynamo light systems, who mostly forgot their bike lights, because they "didn't plan to ride so late" or "forgot to charge their lights" or "forgot the lights". This wouldn't happen with a dynamo system. If you are organized well enough to avoid this, congratulations! However too many people aren't, unfortunately. I'd probably end up without a light at night on my city bike more often than i'd like (because "life happens while you're busy making other plans")
My (cylcocross/road) bike lights (Lupine SL-F or Outbound Focal Road) are adjusted to give me a usable beam distance of 150-175 feet, and they do not blind people in that setting (and any other user of those high powered cut-off lamps does the same). What else would be the point of using a 500-1000 lm bike light?? Even my fairly weak dynamo powered lamp (~100-150 lm) is adjusted in such a way that the beam illuminates at least 20 m (65 ft) in front of the bike. If i ride at 29 km/h (18 mph), i travel at a speed of 8 m/s (26 ft/s). The average reaction time is 1 sec. If the brightest spot is 2 car lengths (30 ft) in front of my bike, it is not possible at this speed to react and stop in time, a crash is not avoidable.
Were my car's dipped beam only able to illuminate 30 m, i'd never drive at night. Luckily it reaches 50-60m, but even that is way too little for 70 mph. But on a car you can either use the high beam or you have enough cars in front of you that illuminate the road further in the distance.
If your arguments were true, every car would use a conical beam shape. But this is for obvious reasons not the case. Since we are here in a dynamo thread and not in a "conical beams do not blind" thread, i won't answer in depth to your calculations. But shortly i think you forgot the scattered lights in your calculation and made a few assumptions which are not correct. Any beam shot of a conical lamp (unless it is pointed right in front of the bike) shows plenty of (blinding) scattered light, unless the light it is set to such a low mode that it only has a "be seen" function, but not a "i can see something myself" function. I am happy to discuss this in depth via private message, if you want, alternatively you could open a new thread on this matter (if there isn't one already). I think the following two videos show nicel the difference between a conical beam and a cut-off beam (which are typical for dynamo lamps) And car lights have even in the states more requirements than to be seen from 500ft, but it seems to me for bike lights this is the only requirement.
As for “blinding”, if you are directly in front of a light with a cut off there is enough scatter that the lights have a dazzling effect. The world also isn’t flat so any hill is going to make the cut-off move up and down. I’ve seen lights with “cut-offs” on bicycles and can’t tell the difference head on. But, again, I don’t ride where I’m going to be riding close enough to bicycles going the other way to “blind” anyone. I’m usually 22 feet or more away from someone on the other side of the road.
__________________
Stuart Black
Plan Epsilon Around Lake Michigan in the era of Covid
Old School…When It Wasn’t Ancient bikepacking
Gold Fever Three days of dirt in Colorado
Pokin' around the Poconos A cold ride around Lake Erie
Dinosaurs in Colorado A mountain bike guide to the Purgatory Canyon dinosaur trackway
Solo Without Pie. The search for pie in the Midwest.
Picking the Scablands. Washington and Oregon, 2005. Pie and spiders on the Columbia River!
Stuart Black
Plan Epsilon Around Lake Michigan in the era of Covid
Old School…When It Wasn’t Ancient bikepacking
Gold Fever Three days of dirt in Colorado
Pokin' around the Poconos A cold ride around Lake Erie
Dinosaurs in Colorado A mountain bike guide to the Purgatory Canyon dinosaur trackway
Solo Without Pie. The search for pie in the Midwest.
Picking the Scablands. Washington and Oregon, 2005. Pie and spiders on the Columbia River!
Last edited by cyccommute; 09-17-19 at 07:49 PM.
#50
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Location: Madison, WI
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Bikes: 1961 Ideor, 1966 Perfekt 3 Speed AB Hub, 1994 Bridgestone MB-6, 2006 Airnimal Joey, 2009 Thorn Sherpa, 2013 Thorn Nomad MkII, 2015 VO Pass Hunter, 2017 Lynskey Backroad, 2017 Raleigh Gran Prix, 1980s Bianchi Mixte on a trainer. Others are now gone.
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I am staying out of your other arguments at this time, but the one I commented on I felt warranted correction.
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