Python Code with Inbuild libraries
easy python code \n\n```\n\nclass CombinationIterator:\n    \n    def init(self, characters: str, combinationLength: int):\n        from itertools import combin
easy python code \n\n```\n\nclass CombinationIterator:\n    \n    def __init__(self, characters: str, combinationLength: int):\n        from itertools import combinations\n        self.comb = list(combinations(characters, combinationLength))\n        self.count = len(self.comb)\n        self.i = 0\n        \n    def next(self) -> str:\n        t = self.comb[self.i]\n        self.i += 1\n        return "".join(t)\n    \n\n    def hasNext(self) -> bool:\n        if self.i < self.count:\n            return True\n        else:\n            return False
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