114 21 2 3 4 5 6 31 2 3 4 51 6 45 514 67 742 81 2 3 4 12 918 101 2 3 4 18 111 2 7 4 5 121 2 7 13 5 9 1314 149 154 169 1716 18./appendop.tests: line 83: x: readonly variable 19