<wob_jonas> learn Angband is Morgoth\'s second dungeon (the first was Utumno). When the greater and lesser people of Middle-Earth together defeated Morgoth in Angband, they were too lazy to go to for 100% completion, so some evil spirits in Angband survived for a sequel, and Morgoth himself recovered and was the final boss in Numenor.

A promise problem is one that happens because you promise too much. Their reduction to NP is p. difficult.