(assert (= x9_plus 0)) (assert (= x9_minus 0)) (assert (= x7_plus 1)) (assert (= x7_minus 0)) (assert (= x5_plus 0)) (assert (= x5_minus 0)) (assert (= x4_plus 0)) (assert (= x4_minus 0)) (assert (= x0_plus 0)) (assert (= x0_minus 0)) (assert (= x8_plus 0)) (assert (= x8_minus 0)) (assert (= x2_plus 0)) (assert (= x2_minus 0))