#get top elements of a list using stream

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full zincBOT
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versed sinew
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Your example removes nodes that are their own descendants, which I imagine cannot happen

edgy mica
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dont quite get what you mean. anyways heres better explanation.
ex: the given nodes are the circled ones of both colors. the final list should only contain the blue ones.
the red node is removed because it is the descendent of another given node

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