NO b a a x a x a a a x b b b x b b x a b a x 2.1 b a a a c_1 1 a a a x b b b x b b b b c_1 b b x a b a x a b a b b c_1 1 1 1 b b x a b a x a b a a b a c_1 1 b a a x a x a a b a c_1 b a a a c_1 b a a x a x a a c_1 a 1 1 b 1 c_1 0 b 0 3 c_1 0 2 a 1 1 ACP 0.72