class Nokogiri::CSS::Parser

def _reduce_45(val, _values, result) 

def _reduce_45(val, _values, result)
      case val[0]
      when 'even'
        result = Node.new(:NTH, ['2','n','+','0'])
      when 'odd'
        result = Node.new(:NTH, ['2','n','+','1'])
      when 'n'
        result = Node.new(:NTH, ['1','n','+','0'])
      else
        result = val
      end

    result
end