Liam liked that Olivia liked that Ava preferred to walk .
like . agent ( x _ 1 , Liam ) AND like . ccomp ( x _ 1 , x _ 4 ) AND like . agent ( x _ 4 , Olivia ) AND like . ccomp ( x _ 4 , x _ 7 ) AND prefer . agent ( x _ 7 , Ava ) AND prefer . xcomp ( x _ 7 , x _ 9 ) AND walk . agent ( x _ 9 , Ava )