vocab: stop re-teaching a word later in the same session (239 tags)

A word tagged VOCAB in one activity was tagged again in later activities of the
same session, so the learner got the same chip repeatedly — most visibly in the
pronunciation drills, which re-listed every word from the dialogue before them
(reported: book 7 session 1-2). Rule applied: drop a VOCAB whose word was
already tagged in an EARLIER activity of that session. Repeats INSIDE one
activity are kept — those teach distinct senses ('stuck to his finger' vs
'stuck the milk in the fridge', 'shop' as verb then noun). Also dropped chips
for plurals of already-known words in book 7 session 1-2, where the drill
teaches the singular/plural pair rather than new vocabulary. No session lost
all of its vocabulary (verified).

Co-authored-by: Cursor <cursoragent@cursor.com>

book-4-lesson-3.module

@@ -130,9 +130,7 @@ LINE: He has six of these shirts. {bk04-l3a-f1-11.mp3}
 LINE: He's wearing a new belt. {bk04-l3a-f1-12.mp3}
 LINE: He has a new hat, too. {bk04-l3a-f1-13.mp3}
 
-VOCAB: to take off
 VOCAB: clothes
-VOCAB: to put on
 LINE: After work, Captain Collins *takes off* his uniform. {bk04-l3a-f1-14.mp3}
 LINE: He *puts on* civilian *clothes*. {bk04-l3a-f1-15.mp3}
 LINE: Today he *took off* his uniform before dinner. {bk04-l3a-f1-16.mp3}
@@ -589,14 +587,12 @@ REPEAT
 VOCAB: to fall asleep
 LINE: He went to bed at 11:00 p.m. and fell asleep at 11:30 p.m. {st-page_065_003.jpg}
 
-VOCAB: asleep
 LINE: He was asleep at 12 midnight. {st-page_065_003.jpg}
 
 VOCAB: to wake up
 LINE: He always wakes up early. {st-page_065_004.jpg}
 LINE: He woke up at 6:00 a.m. {st-page_065_004.jpg}
 
-VOCAB: awake
 LINE: He's awake at 6:00 a.m. {st-page_065_004.jpg}
 
 # Source: LLA 3B Figure 5