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  1. or download this
    @arr = (1 .. 20);
foreach $i ( 0 .. $#arr ) {
  # do something
}
  2. or download this
    foreach $i ( 0 .. 19 ) {
  # do something
}
  3. or download this
    foreach $i (1 .. 20)) {
  # do something
}
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    foreach $i (@arr)) {
  # do something
}