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(A) An example of a non-lattice pair, Irritable bowel syndrome variant of childhood and Irritable bowel syndrome with diarrhea (lower two nodes), sharing two minimal common ancestors, Irritable bowel syndrome and Disorder of colon (upper two nodes). (B) A suggested correction for (A). By making Irritable bowel syndrome a child of Disorder of colon, the subgraph is transformed into a lattice.
