Symmetry rotation reflection configuration x [n]->[m] X (m]ln] positions colors permutation π：[n 1m on-to Symmetry 0 1 2 3 4 5 rotation reflection configuration x : [n] ! [m] X = [m] [n] positions colors permutation ⇡ : [n] 1-1 ￾￾￾! on-to [n]