Li-Fan Chen => YSITD: 0 Z 1 S ( Z ) 2 S (S Z) 3 S (S (S Z)) #5a0c545e8616ce3e622b85c2

Li-Fan Chen says to YSITD

0 Z 1 S ( Z ) 2 S (S Z) 3 S (S (S Z))

at Wed, Nov 15, 2017 10:51 PM