edge rules of phosphorus allotropes

Input interpretation

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phosphorus allotropes | edge rules

Results

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black phosphorus | {} red phosphorus | {} diphosphorus | {1->2} white phosphorus | {1->2, 1->3, 1->4, 2->3, 2->4, 3->4}

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phosphorus allotropes | edge rules | {{}, {}, {1->2}, {1->2, 1->3, 1->4, 2->3, 2->4, 3->4}} ()