map {
        y/ //d;         # delete spaces.  None of the words have any, so no-op.
        $= /= 1.5;      # $=, initially 60, can only contain integer values.
                        # Since map runs this 4 times for the 4 elements of @_
                        # $= becomes 60 -> 40 -> 26 -> 17 -> 11
        $.++;           # The test ($.-- && redo) ended at 0, which means that
                        # $. ended up with the value -1.  Here it becomes 3
        $_
    }