The above phrasal representation allows for an understanding of each lexical item. In order to build a tree using Merge, using bottom-up formation the two final element of the phrase are selected and then combined to form a new element on the tree. In image a) you can see that the determiner "the" and the Noun Phrase "pie" are both selected. Through the process of Merge, the new formed element on the tree is the determiner Phrase (DP) which holds, "the pie," which is visible in b).