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isBalanced is a function.
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isBalanced("[]") should return true.
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isBalanced("]][[[][][][]][") should return false.
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isBalanced("[][[[[][][[[]]]]]]") should return true.
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isBalanced("][") should return true.
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isBalanced("[[[]]]][[]") should return true.
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isBalanced("][[]") should return true.
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isBalanced("][[][]][[[]]") should return true.
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isBalanced("[[][]]][") should return true.
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isBalanced("[[[]]][[]]]][][[") should return true.
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isBalanced("[]][[]]][[[[][]]") should return true.
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isBalanced("][]][[][") should return true.
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isBalanced("[[]][[][]]") should return true.
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isBalanced("[[]]") should return true.
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isBalanced("]][]][[]][[[") should return true.
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isBalanced("][]][][[") should return true.
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isBalanced("][][") should return true.
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isBalanced("[[]]][][][[]][") should return true.
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isBalanced("") should return true.