- const pattern 0 0 0 1 1 1 1 1 1 1 1 1 1 1 0 1 1 1 1 0 1 2 2 1 [2,3,4] [] - non-const pattern 0 0 0 1 1 1 1 1 1 1 1 1 0 1 1 1 1 0 1 2 2 1 [2,3,4] []