Is the relation between "1 G" and "5 Y" simply the position in the file? Then
my @qfns;
my @fhs;
for my $qfn (@qfns) {
open(my $fh, '<', $qfn)
or die("Can't open \"$qfn\": $!\n");
push @fhs, $fh;
}
for (;;) {
my @lines;
my $all_done = 1;
my $some_done = 0;
for my $fh (@fhs) {
push @lines, my $line = <$fh>;
if (defined($line)) { $some_done = 1; }
else { $all_done = 0; }
}
exit(0) if $all_done;
die("Premature eof\n") if $some_done;
chomp @lines;
print(join(' ', @lines), "\n");
}
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