# File lib/chronic/repeater.rb, line 90
    def self.scan_for_units(token)
      {
        /^years?$/ => :year,
        /^seasons?$/ => :season,
        /^months?$/ => :month,
        /^fortnights?$/ => :fortnight,
        /^weeks?$/ => :week,
        /^weekends?$/ => :weekend,
        /^(week|business)days?$/ => :weekday,
        /^days?$/ => :day,
        /^hours?$/ => :hour,
        /^minutes?$/ => :minute,
        /^seconds?$/ => :second
      }.each do |item, symbol|
        if item =~ token.word
          klass_name = 'Repeater' + symbol.to_s.capitalize
          klass = Chronic.const_get(klass_name)
          return klass.new(symbol)
        end
      end
      return nil
    end