Two Simple Pebbling Puzzles

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Pebbling is a game where players strategically place pebbles on the vertices of a graph, creating a complex puzzle to solve. A move is made when one takes two pebbles from a vertex, discards one, and places the other on an adjacent connected vertex. To gain a deeper understanding of this engaging game, refer to Wikipedia's detailed description at https://en.wikipedia.org/wiki/Graph_pebbling. In these clever puzzles, vertices are represented by shallow bowls and connections are represented by rods. The challenge begins with two pebbles placed on each vertex, requiring players to make strategic moves to leave a single pebble on the central vertex. To get started, an STL pebble file is included, but any collection of small objects can be used as substitutes. Additionally, OpenSCAD code is provided for further customization and modification.