2 x2 1 7

2 x2 1 72 x2 1 72 x2 1 72 x2 1 72 x2 1 72 x2 1 7
2 x2 1 72 x2 1 72 x2 1 72 x2 1 72 x2 1 72 x2 1 7
2 x2 1 72 x2 1 72 x2 1 72 x2 1 72 x2 1 72 x2 1 72 x2 1 72 x2 1 72 x2 1 72 x2 1 72 x2 1 72 x2 1 72 x2 1 72 x2 1 72 x2 1 72 x2 1 72 x2 1 72 x2 1 72 x2 1 72 x2 1 72 x2 1 72 x2 1 72 x2 1 72 x2 1 72 x2 1 72 x2 1 72 x2 1 72 x2 1 72 x2 1 72 x2 1 72 x2 1 72 x2 1 72 x2 1 72 x2 1 72 x2 1 72 x2 1 7