docs: def start(st_reg_number):
      """Checks the number valiaty for the Rondônia state"""
  
      divisor = 11
  
      weight = [6, 5, 4, 3, 2, 9, 8, 7, 6, 5, 4, 3, 2]
  
      if len(st_reg_number) != 9 and len(st_reg_number) != 14:
          return False
  
      if len(st_reg_number) == 9:
          sum_total = 0
          peso = 6
          for i in range(3, len(st_reg_number)-1):
              sum_total = sum_total + int(st_reg_number[i]) * peso
              peso = peso - 1
  
          rest_division = sum_total % divisor
          digit = divisor - rest_division
  
          if digit == 10:
              digit = 0
  
          if digit == 11:
              digit = 1
  
          return digit == int(st_reg_number[len(st_reg_number)-1])
  
      else:
          sum_total = 0
          for i in range(len(st_reg_number)-1):
              sum_total = sum_total + int(st_reg_number[i]) * weight[i]
  
          rest_division = sum_total % divisor
          digit = divisor - rest_division
  
          if digit == 10:
              digit = 0
  
          if digit == 11:
              digit = 1
  
          return digit == int(st_reg_number[len(st_reg_number)-1])