User blog comment:Monkey.D.Me/League of Red Stuff .. no, its not KoolAid/@comment-4630086-20120504115218

Hey MDM, I have some explanation... Why in vol 12 Crocus said if he has A blood type? Maybe, each country in OP call the blood types differently. So if we assume something like this:

F = B

X = A

XF = AB (because no BA blood type, so the assumption that F = B and X = A is true)

S = O