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  1. or download this
    use warnings;
use strict;
...
    my ($empty_inches) = @_;
    return $litres - empty_litres($empty_inches);
}
  2. or download this
    total cubic inches: 117.810000
total litres: 1.930560
...
percent litres remaining: 53.333333
percent litres missing: 46.666667
percent cubes remaining: 53.333333