e/Graph pebbling

Information
has gloss	eng: Graph pebbling is a mathematical game and area of interest played on a graph with pebbles on the vertices. Game play is composed of a series of pebbling moves. A pebbling move on a graph consists of taking two pebbles off one vertex and placing one on an adjacent vertex. π(G), the pebbling number of a graph G is the lowest natural number that fulfills the following property:
lexicalization	eng: graph pebbling
instance of	c/Games of mental skill