m=10m++－－－m+++m－m－－+m++－m－－+m++
m = 10 m++ --> m = 11
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-
- (ignore this line) m++ --> m = 12
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- (ignore this line) m - m --> 12 - 12 = 0
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- (ignore this line)
- m++ --> 0 + 12 = 12
- m - - --> 12 - (-12) = 24
- m++ --> 24 + 12 = 36
- m - - --> 36 - (-12) = 48
- m++ --> 48 + 12 = 60
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