st: combining string vars

["Erica Seiguer" <erica_seiguer@student.hms.harvard.edu>]

if i have two string variables, is it possible to combine them? ie, the
first var is two digits referring to a state (i.e. 44) and the second var is
4 digits referring to facility number (i.e. 0010). I want a var to look like
440010.

thanks!

erica

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