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  • hi, thanks, but i want to know why its 4x + and 1x - (++++-) not 8x + and 2x -(++++++++--) sometimes i see ++-- why it is not +- (50%:50%),? Commented Sep 11, 2018 at 14:02
  • @huhao it's the ratio of added and removed lines. Have a look at the SO question this is a duplicate of. Commented Sep 11, 2018 at 14:56
  • thank you, i think i've got it Commented Sep 12, 2018 at 9:20