Question 1163149
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It is not for the first time I see this number  "1.67"  in the post, 


and I think that these problems go from the same source.



I think that I do understand your idea,  but I think also that you are struggling 

because you have no an appropriate word in your mouth to express your idea adequately.



This word is the  "increment"  in this case.



Try to use it - - - I think that using it you will be able to express your idea/ideas more adequately.