Start with what your board already knows.

Why some letter combinations are not published

Wurdella does not create an empty page for every possible alphabet combination. Established broad patterns return at least eight playable words; first-and-last patterns return at least five. New single-letter and two-required-letter lists need at least twelve matches. A new list is omitted when its results overlap an earlier list by 85% or more using intersection divided by union. This keeps the index practical for players and prevents thin lists that repeat a heading without giving you enough information to solve anything.