(;SZ[4]AB[aa]AB[ba]AB[bb]AB[ad]AW[ca]AW[da]AW[db]AW[dc]AW[dd]AW[cd]AB[bd]C[Sorry for a lot of correct answers. This is a problem because has one wrong path.FORCE]AP[goproblems]
(;B[ab]C[FORCE];W[bc]C[FORCE]
(;B[ac]C[FORCE];W[cb])
(;B[cb]C[FORCE];W[ac])
(;B[cc]C[FORCE];W[ac]))
(;B[ac]C[FORCE]
(;W[bc]C[FORCE]
(;B[cb]C[FORCE];W[ab])
(;B[cc]C[RIGHT]))
(;W[cc]C[FORCE]
(;B[ab])
(;B[bc]C[RIGHT])
(;B[cb]C[RIGHT])))
(;B[bc]C[RIGHT])
(;B[cc]C[RIGHT])
(;B[cb]C[FORCE]
(;W[ac]C[FORCE]
(;B[ab]C[FORCE];W[bc])
(;B[bc]C[RIGHT])
(;B[cc]C[RIGHT]))
(;W[bc]C[FORCE]
(;B[ab]C[FORCE];W[ac])
(;B[ac]C[FORCE];W[ab])
(;B[cc]C[RIGHT]))))