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__DATA__
line1=10
line2=30
...
line9=67
line10=Coder
line11=false

line12=00
line2=11
line3=
line4=questionable

my @outfile = (
    "line1=10",
    "line2=30",
...
for my $quad(@quads) {
    print $quad . "\n";  # to console; writing to file "final.txt" is 
+left as an exercise for OP
}