Abstract
Recently, 2-protected nodes were studied in the context of ordered trees and -trees. These nodes have a distance of at least 2 to each leaf. Here, we study digital search trees, which are binary trees, but with a different probability distribution underlying. Our result says, that \emph{grosso modo} some 31% of the nodes are 2-protected. Methods include exponential generating functions, contour integration, and some elements from -analysis.
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