Version: 0.1.00.1.10.1.20.2.00.2.10.3.00.4.00.4.10.4.20.4.30.5.00.6.00.6.10.6.21.0.01.0.11.1.01.1.1
line 4: x is already declared
line 5: x is already declared
line 9: f is already declared
line 14: y is already declared