BM6(H p  (x(x(x(x2ddd(x(x(x(x(x22(x(x2ddd(x(x(x2ddd(x(x2(x2dddddd(x22222222(x22dddddd(x(x(x(x2222222ddd(x(x2(x(x(x(x22ddd(x22222222(x22dddddd(x(x(x(x2dddddd(x(x(x(x(x(x(x(x(xdddddddddddddddddd(x