0_0_13002759_3790.c: In function `per':
0_0_13002759_3790.c:13: error: syntax error before '/' token
0_0_13002759_3790.c: At top level:
0_0_13002759_3790.c:18: error: syntax error before '+' token
0_0_13002759_3790.c:18: error: conflicting types for 'per'
0_0_13002759_3790.c:11: error: previous definition of 'per' was here
0_0_13002759_3790.c: In function `main':
0_0_13002759_3790.c:50: error: syntax error before '/' token
0_0_13002759_3790.c:50: error: syntax error before ')' token
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