Table 2.

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

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

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.