MAYBE
0.07/0.19	MAYBE
0.07/0.19	
0.07/0.19	Problem:
0.07/0.19	 app(x,y) -> helpa(0(),plus(length(x),length(y)),x,y)
0.07/0.19	 plus(x,0()) -> x
0.07/0.19	 plus(x,s(y)) -> s(plus(x,y))
0.07/0.19	 length(nil()) -> 0()
0.07/0.19	 length(cons(x,y)) -> s(length(y))
0.07/0.19	 helpa(c,l,ys,zs) -> if(ge(c,l),c,l,ys,zs)
0.07/0.19	 ge(x,0()) -> true()
0.07/0.19	 ge(0(),s(x)) -> false()
0.07/0.19	 ge(s(x),s(y)) -> ge(x,y)
0.07/0.19	 if(true(),c,l,ys,zs) -> nil()
0.07/0.19	 if(false(),c,l,ys,zs) -> helpb(c,l,greater(ys,zs),smaller(ys,zs))
0.07/0.19	 greater(ys,zs) -> helpc(ge(length(ys),length(zs)),ys,zs)
0.07/0.19	 smaller(ys,zs) -> helpc(ge(length(ys),length(zs)),zs,ys)
0.07/0.19	 helpc(true(),ys,zs) -> ys
0.07/0.19	 helpc(false(),ys,zs) -> zs
0.07/0.19	 helpb(c,l,cons(y,ys),zs) -> cons(y,helpa(s(c),l,ys,zs))
0.07/0.19	
0.07/0.19	Proof:
0.07/0.19	 Open
0.17/0.20	EOF