missing import
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@ -1042,6 +1042,7 @@ class Tree(MutableLibrary):
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@classmethod
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@classmethod
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def mk(cls, top: str) -> Tuple['Tree', 'Pattern']:
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def mk(cls, top: str) -> Tuple['Tree', 'Pattern']:
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from .pattern import Pattern
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tree = cls(top=top)
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tree = cls(top=top)
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pat = Pattern()
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pat = Pattern()
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tree[top] = pat
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tree[top] = pat
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