(META CLUE: Old _________) variation on a word ladder. each row has two added letters or missing letters. letter order isn't scrambled. for exp: "poe", "pod", "ore", and "red" are appropriate follow-ups to "pored" , but "pro", "doe", or "rep" aren't. likewise "trunk" and "round" are appropriate follow-ups to "run" but "nurse" isn't.