First Phenomenon
From Scientolipedia
when a student misses understanding a word, the section right after that word is a blank in his memory. You can always trace back to the word just before the blank, get it understood and find miraculously that the former blank area is not now blank in the bulletin. The above is pure magic. (HCO PLHubbard Communications Office Policy Letter (HCO PL 24 Sept 70R)
24 Sept 64)