1 2 3 4 5 6 7 8 9 E H E H E H E H E * T c X - T c X - * X X X X X X X * T c X - X - * X X X X X * X - X - * X X X * T c * X * handedness 1 2 3 R handedness 2 3 4 R handedness 3 4 5 R handedness 4 5 6 L handedness 5 6 7 R handedness 6 7 8 R handedness 7 8 9 R handedness 1 2 9 L handedness 1 6 7 R sheetS 1 3 5 7 9