def __init__(self, characters: str, combinationLength: int):
    self.data = characters
    self.res = self.combine(self.data, combinationLength)
    self.counter = 0
    self.res_count = len(self.res)
def __init__(self, characters: str, combinationLength: int):
    self.data = characters
    self.res = self.combine(self.data, combinationLength)
    self.counter = 0
    self.res_count = len(self.res)