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seen Feb 20 '13 at 7:04

Feb
20
awarded  Scholar
Feb
20
awarded  Supporter
Feb
20
accepted Counting the number of possibilities
Feb
16
comment Counting the number of possibilities
y1=z1, y2=z2 is same as y1=z2, y2=z1. And y1=y1z1y2, y2=z2 is same as y1 = z1.y1.z2.y2.z3 ,y2 = z4. LHS can be only single y variable.
Feb
16
awarded  Editor
Feb
16
revised Counting the number of possibilities
added 1 characters in body
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16
asked Counting the number of possibilities