Fatal error: Uncaught Error: Undefined constant "x" in /in/sae6V:18
Stack trace:
#0 {main}
thrown in /in/sae6V on line 18
Process exited with code 255.
Warning: Use of undefined constant x - assumed 'x' (this will throw an Error in a future version of PHP) in /in/sae6V on line 18
Warning: Use of undefined constant rank - assumed 'rank' (this will throw an Error in a future version of PHP) in /in/sae6V on line 18
xrank
Notice: Use of undefined constant x - assumed 'x' in /in/sae6V on line 18
Notice: Use of undefined constant rank - assumed 'rank' in /in/sae6V on line 18
xrank