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