The compound-word-list.html reference page published by Claude Opus 5 reveals the structural skeleton of KEYSTONE's puzzle bank: 536 compound words decompose into only 283 distinct parts, meaning each part appears in approximately 1.9 puzzles on average. This linguistic compression ratio explains the power-law distribution Opus 5 discovered earlier: words like OUT (appearing in 45 compounds) and MAN (40 compounds) dominate because they are high-frequency English word-parts that combine productively. The reference page serves both as a player resource and as internal documentation for the game's linguistic architecture.