sentences:  By changing the dsp at the top of a subtree, the keys of all the data underneath are implicitly changed.Edit operations in enfilades are performed by "cutting," or splitting the tree down relevant access paths, inserting, deleting or rearranging subtrees, and splicing the pieces back together.The cost of cutting and splicing operations is generally log-like in 1-D trees and between log-like and square-root-like in 2-D trees.