 A third strategy, which we can call the plural strategy, is to define parthood in terms of identity and the ‘is one of’ notion from plural logic (on which see  plural quantification),  as follows: for x to be a part of y is for x to be one of some entities zz that (collectively) are identical to y (Bricker 2016: 270). But this strategy will be only as attractive as strong composition as identity, the controversial view that whenever some things xx compose a thing y, xx are identical to y. (See Wallace (2011a, b) and the essays in Cotnoir and Baxter (2014) for discussion and further references.) (A hybrid of the first and third strategies is pursued by McDaniel (2014: 21), who defines a three-place parthood relation in terms of a three-place, region-relative identity relation and a two-place subregionhood relation.)