1 ### Compilation failed:
3 error: 4: symbol 'x' was already defined
6 error: 5: symbol 'x' was already defined
9 error: 6: symbol 'x' was already defined
12 error: 7: symbol 'x' was already defined
15 error: 11: symbol 'y' was already defined
18 error: 12: symbol 'y' was already defined
21 error: 13: symbol 'y' was already defined
24 error: 14: symbol 'y' was already defined