You’re in an upstairs hallway of Trump mansion looking at what must be 101 books. You’re not supposed to be here. The party’s downstairs, why did you even come up here in the first place? Oh yeah, you overheard someone mention a secret passageway triggered by pulling two books at the same time on the mahogany bookshelf. You estimate that you can test two book pairs each second. On average, how long will it take you to get through the passageway and achieve unknowable glory?