S 2t t 2

S 2t t 2S 2t t 2S 2t t 2S 2t t 2S 2t t 2S 2t t 2
S 2t t 2S 2t t 2S 2t t 2S 2t t 2S 2t t 2S 2t t 2
S 2t t 2S 2t t 2S 2t t 2S 2t t 2S 2t t 2S 2t t 2S 2t t 2S 2t t 2S 2t t 2S 2t t 2S 2t t 2S 2t t 2S 2t t 2S 2t t 2S 2t t 2S 2t t 2S 2t t 2S 2t t 2S 2t t 2S 2t t 2S 2t t 2S 2t t 2S 2t t 2S 2t t 2S 2t t 2S 2t t 2S 2t t 2S 2t t 2S 2t t 2S 2t t 2S 2t t 2S 2t t 2S 2t t 2S 2t t 2S 2t t 2S 2t t 2