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# find sum of first 100 digits
my $sum = 0;
for my $i (0 .. 99) {
    $sum += $i;
}

# print lines from a file handle and stop when done
while (my $line = <FILE>) {
    print $line;
}

for (0 .. 99) {
    print "$_\n";
    last if $_ == 42;
}