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if = 0 then ??R? because CORE =1 and R/D change -1
if = 2 then ??D? because CORE =1 and R/D change +1
if = 1 then ?O?? because CORK = 1, can't be C because PORK = 1, and P/C changed. Cant be ??R? because of the above. And Can't be K because of the K/E change but CORE still = 1.