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$start = $a; $end = ++$a; for ($_ = $start; $_ <= $end; $_++) { ... }
for (++$x .. $x++ . $x) { ... } # starting at ++$x # ending at $x++ . $x # THE END HAS MODIFIED THE START
print ++$x, ++$x, ++$x; # 333
$x = 3; print ++$x/$x--; # 3/4 => 0.75
for (++$x .. $x++ . $x--) { ... } # or for (++$....$.++.$.--) { ... }
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