(from AG01 3.14) (VAR u v w y z) (RULES concat(leaf,y) -> y concat(cons(u,v),y) -> cons(u,concat(v,y)) less_leaves(x,leaf) -> false less_leaves(leaf,cons(w,z)) -> true less_leaves(cons(u,v),cons(w,z)) -> less_leaves(concat(u,v),concat(w,z)) )
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