You need 3 levels of iteration to get 3 character keys.
Something like this:
my %line=qw(A 1 B 1 C 1);
my @tojoin = qw (W X Y Z);
for my $l(sort keys %line){
for my $k(@tojoin){
$line{qq($l$k$_)}=1
for @tojoin
}
};
print qq($_\n) for sort keys %line ;
-- Output ---
A
AWW
AWX
AWY
...snip...
B
BWW
BWX
...snip...
BZZ
C
CWW
...snip...
CZZ
"Man cannot live by bread alone...
He'd better have some goat cheese and wine to go with it!"
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