P t s

P t sP t sP t sP t s
P t sP t sP t sP t sP t sP t sP t sP t s
P t sP t sP t sP t sP t sP t sP t sP t sP t sP t sP t sP t s
P t sP t sP t sP t sP t sP t sP t sP t sP t sP t sP t sP t sP t sP t sP t sP t s
P t sP t sP t sP t sP t sP t s