key knowledge lock secret silver wisdom wood book books learning paper pile reading school stack study apple education fruit literature carved Cithara cutout guitar isolated music Scroll stone thrumpet trumpet acadamic cognition göttingen library public research student students studying college elementary eraser highschool homework lead learn pencil teach teaching write writing yellow encyclopedia information literary open page pages read science sheet chinese clever letter mandatory nonsence road roadsign rule rules sign signs stop stopped strange street ting understand understandable warning archive bestseller booklet box copy cover dictionary essay knowing lecture letters manual market publication text textbook work

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