code: function getCzechForm (c) {
      if (c === 1) {
        return 0
      } else if (Math.floor(c) !== c) {
        return 1
      } else if (c % 10 >= 2 && c % 10 <= 4 && c % 100 < 10) {
        return 2
      } else {
        return 3
      }
    }
docs: Internal helper function for Czech language.