75179_0_29807.c: In function `midtrav':
75179_0_29807.c:64: error: `head' undeclared (first use in this function)
75179_0_29807.c:64: error: (Each undeclared identifier is reported only once
75179_0_29807.c:64: error: for each function it appears in.)
75179_0_29807.c:75: error: syntax error before '}' token
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