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my @atags = qw( 1 2 3 4 );
my @btags = qw( 9 8 7 6 );
...
say for @{values %alphabet};

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
...
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