Germany Allied Occupation Mi#82 - Please Help With Color

Question to experts in Germany occupation stamps:
I have picture attached: All of those stamps are obviously #82 perforation 14 - it makes them type "A". But type "A" has 3 possible colors:
a - dark violet grey to dark grey-violet;
b - blue-violet
c - (dark)violet
My guess is that all 4 left stamps are type "a" (two of them just discolored).
But what about stamps on the right? Are they all type "b"?
Then what would be color of type "c"?

KGB, what are you asking? He is using a Michel. He also needs help with a perforation gauge - these are not perforated 14 but 11.
Igopp, I believe you have all three colors there. The bottom left ones could be the (dark)violet ones.

Peter

Peter, I didn't see the 'Mi' in the title. I deleted my question, but not fast enough!

The colors can be difficult to ascertain from a scan, but I'd guess the four at left are MiNr 82 a W A, and the remainder are MiNr 82 b W a. All are comb perf 14:14 1/4.

Thanks everybody. I feel the same as PostmasterGS: bottom left ones are most likely color "a".
Peter - actually they all perforation 14:14 1/4.
Here is another scan with the same two stamps (low) and two other stamps with perforation 11:11 (82aWB).
This is another confirmation of color: Color "a" is only one possible color for Type "B".
Now I really want to see how color "c" looks like.
Thanks again.