[EpiData-list] Create one variable from two or more variables

Is there a way to automatically create a variable from 2-3 entered variables? For example: I have var1 ###### var2 ## var3 #

I would like epidata entry to automatically populate a new variable for each case, where the value would be var1, var2, var3 appended with each other:

var4 var1var2var3

I tried creating a data check command:

~~~~~~~~~~~~~~~~~~~~~~ var4 MUSTENTER AFTER ENTRY var4="var1" + string(var1) + "var2" + string(var2) + "var3" + string(var3) END END ~~~~~~~~~~~~~~~~~~~~~~~~~ But that did NOT work. Thanks so much J.H.

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