docs: function convertTenths(num) {
    if (str(num).length > 2) {
      throw new Error("Must have at most 2 digits");
    }
  
    num = int(num);
    var bases = "";
  
    // less than 10
    if (num < 10) {
      return mapOnes[num];
    }
  
  
    // 10-19
    if (10 <= num && num < 20) {
      return mapTens[num];
    }
  
    // 20-99
    var firstNum = mapTenths[int(str(num)[0])];
    var secondNum = mapOnes[int(str(num)[1])];
  
    if (!secondNum) {
      return firstNum;
    }
  
    return firstNum + " " + secondNum;
  }