Can't use string ("2") as an ARRAY ref while "strict refs" in use at
	./concat.pl line 9 (#1)
    (F) Only hard references are allowed by "strict refs".  Symbolic
    references are disallowed.  See perlref.
    
Uncaught exception from user code:
	Can't use string ("2") as an ARRAY ref while "strict refs" in use at ./concat.pl line 9.
 at ./concat.pl line 9