Solve a Rummy Deck (12-card hand).

To solve a 12-card Rummy hand, you need to form sets and runs. A set consists of three or four identical tiles (e.g., three Red 7s). A run is a sequence of three or more tiles of the same color in numerical order (e.g., Blue 4, Blue 5, Blue 6). The goal is to arrange your 12 tiles into valid sets and runs, potentially using all tiles.