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class Solution:
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    def isValid(self, string: str) -> bool:
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        while True:
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            if "()" in string:
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                string = string.replace("()", "")
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            elif "{}" in string:
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                string = string.replace("{}", "")
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            elif "[]" in string:
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                string = string.replace("[]", "")
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            else:
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                return not string