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