#!/usr/bin/perl
use strict; # https://perlmonks.org/?node_id=11120564
use warnings;
my $file1 = <<END;
one
two
three
four
five
six
END
my $file2 = <<END;
two
three
four
five
six
seven
END
my $marker = '***MARKER***'; # something not in either string
my $combine = "$file1$marker$file2" =~ s/(.*)\K\Q$marker\E\1//sr;
print $combine;
Outputs:
one
two
three
four
five
six
seven
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