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  1. or download this
    ($sum += chop $number) ... ($sum += $LUHN10_map[chop $number]) while $
    +number ne '';
    
  2. or download this
    ('125', '49927398716', '4992739872')
    
  3. or download this
    ('125', '49927398716', '49927398716','4992739872')