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(define (my-procedure lsts) (map (lambda (xs) (string->number (apply cat(sort xs my-compare)))) lsts))
and I would like it to behave in the following way: (my-procedure 7 4 43 123) //is entered by me
and the output should be 7443123 for example.
However when I try to compile it, I get the following error: unbound variable "cat"
is there something I missed.
Any help is greatly appreciated
Thanks in advance