?? 24 semi-simple comm ring structures on {a,b,c,d} ...

f2 X f2 vs f4 ....

?? depict f4 structure as for example "ab", meaning a=0 and b=1 ...

?? depict f2Xf2 structure as ... ??? ... for example, "ab", meaning a = (0,0) and b = (1,1) .... ?? ...

(?? so some of that 2+2=2X2 stuff is dimly visible here but ok to soft-pedal, i guess .... ??? ....)

?? but need way to distinguish the 2 types .... ?? 4ab and 2ab ... ??? ....

?? 2^24 as already somewhat annoyingly big ... ?? ....

?? try working with euler summand ...... ???? .... ???? .....