2a b a 2b2a b a 2b2a b a 2b2a b a 2b2a b a 2b2a b a 2b2a b a 2b2a b a 2b2a b a 2b2a b a 2b2a b a 2b2a b a 2b2a b a 2b2a b a 2b2a b a 2b2a b a 2b2a b a 2b2a b a 2b2a b a 2b2a b a 2b2a b a 2b2a b a 2b2a b a 2b2a b a 2b2a b a 2b2a b a 2b2a b a 2b2a b a 2b2a b a 2b2a b a 2b2a b a 2b2a b a 2b2a b a 2b2a b a 2b2a b a 2b2a b a 2b2a b a 2b2a b a 2b2a b a 2b2a b a 2b2a b a 2b2a b a 2b2a b a 2b2a b a 2b2a b a 2b2a b a 2b2a b a 2b2a b a 2b2a b a 2b2a b a 2b2a b a 2b2a b a 2b2a b a 2b2a b a 2b2a b a 2b2a b a 2b2a b a 2b2a b a 2b2a b a 2b2a b a 2b2a b a 2b2a b a 2b2a b a 2b2a b a 2b2a b a 2b2a b a 2b2a b a 2b2a b a 2b2a b a 2b2a b a 2b2a b a 2b2a b a 2b
