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problems with delayed write: tag list


Hello,
I have a list of elements of two numbers:myList = {{1,2},{2,7},..}. The first number is in this case always the position. I want to know when the difference is a certain value,myDiff, eg. 5
i=1;myDiff==5;
now= Reap[While[i<Length[myList],i++;
       If[myList[[i,2]]-myList[[i,1]]==myDiff,Sow[i]]];w]
My question is: how do I make "nowFunction[myDiff_]:="? 
I run into tag list errors in the definition when I try that.
P_ter


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