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Table 2 List of “is a” relations identified in Yeganova et al. [ 39 ]

From: Identifying named entities from PubMed® for enriching semantic categories

X is a Y X is a potent Y
X are Y X is the most common Y
X and other Y X are rare Y
X as a Y X is a widely used Y
X such as Y X is an uncommon Y
X is an Y X is an autosomal dominant Y
X as an Y X is a form of Y
X is an important Y X is one of the major Y
X a new Y X is a chronic Y
X are the most common Y X and other forms of Y
X is a rare Y X is a broad spectrum Y
X is a novel Y X is the primary Y
X is a major Y X is a rare autosomal recessive Y
X is an essential Y X is the most common type of Y
X was the only Y X is the second most common Y
X was the most common Y X are the most frequent Y
X is a common Y X is the most widely used Y
X is a new Y X is the most frequent Y
X is a complex Y X is the most common primary Y
X is an effective Y X is one of the major Y
  1. These patterns are summarized as “X is/are/as DT... Y” in our method, where X is a phrase, DT is a determiner and Y is a headword.