YES(?,O(n^1)) Problem: d(x) -> e(u(x)) d(u(x)) -> c(x) c(u(x)) -> b(x) v(e(x)) -> x b(u(x)) -> a(e(x)) Proof: Matrix Interpretation Processor: dimension: 1 interpretation: [a](x0) = x0 + 16, [v](x0) = x0 + 16, [b](x0) = x0 + 29, [c](x0) = x0 + 26, [e](x0) = x0 + 16, [u](x0) = x0 + 4, [d](x0) = x0 + 23 orientation: d(x) = x + 23 >= x + 20 = e(u(x)) d(u(x)) = x + 27 >= x + 26 = c(x) c(u(x)) = x + 30 >= x + 29 = b(x) v(e(x)) = x + 32 >= x = x b(u(x)) = x + 33 >= x + 32 = a(e(x)) problem: Qed