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-9-lesson-4.module

@@ -157,20 +157,11 @@ VOCAB: really
 VOCAB: so
 Narrator: The alarm clock woke them up early the next morning. They were really tired. They didn't want to get up so early, but they did. {st-page_125_003.jpg}
 
-VOCAB: full
-VOCAB: gasoline
-VOCAB: gauge
 VOCAB: to realize
-VOCAB: almost
-VOCAB: empty
 VOCAB: to run out of
-VOCAB: gas station
 VOCAB: to fill up
 Narrator: They started the trip with a full tank of gasoline in the car. After they drove for about 5 hours, Walter checked the gas gauge. He realized the tank was almost empty. He didn't want to run out of gas. He stopped at a gas station in the next block to fill up the car. {st-page_126_001.jpg}
 
-VOCAB: restroom
-VOCAB: men's room
-VOCAB: ladies' room
 Narrator: They filled up the tank and asked the attendant, "Where are the restrooms?" He told them that the restrooms were at the side of the gas station. The men's room was on the left and the ladies' room was on the right. {st-page_126_004.jpg}
 
 # Source: ST §Answer About the Trip
@@ -223,7 +214,6 @@ INTRO: Alex and Rita stop for the night. Listen and repeat the new motel words
 INSTRUCTION: Listen and repeat.
 REPEAT
 
-VOCAB: really
 VOCAB: motel
 VOCAB: pleased
 LINE: Alex is really tired. {page_083_001.jpg} {bk09-l4a-f3-01.mp3}
@@ -237,7 +227,6 @@ LINE: Rita fills the bathtub with water. {page_083_002.jpg} {bk09-l4a-f3-04.mp3}
 LINE: She will bathe and relax. {page_083_002.jpg} {bk09-l4a-f3-05.mp3}
 LINE: She'll take a long bath. {page_083_002.jpg} {bk09-l4a-f3-06.mp3}
 
-VOCAB: baggage
 VOCAB: hard
 VOCAB: soft
 VOCAB: hope to
@@ -245,7 +234,6 @@ LINE: Alex puts his baggage on the hard chair. {page_083_003.jpg} {bk09-l4a-f3-0
 LINE: He sits in the soft chair. {page_083_003.jpg} {bk09-l4a-f3-08.mp3}
 LINE: He hopes to relax before he goes to bed. {page_083_003.jpg} {bk09-l4a-f3-09.mp3}
 
-VOCAB: alarm clock
 VOCAB: sheet
 VOCAB: blanket
 VOCAB: pillow
@@ -303,13 +291,8 @@ INSTRUCTION: Read the story.
 Narrator: Wilda and Walter arrived at the motel at 6:30. They were glad they had reservations because the motel was full. Many people were traveling that day. {st-page_128_001.jpg}
 
 VOCAB: lady
-VOCAB: sheet
-VOCAB: soft
-VOCAB: pillow
-VOCAB: blanket
 Narrator: When they got to their room, a lady was making the bed. She was putting clean sheets on the bed. There were two soft pillows on the bed and a blanket, too. {st-page_128_002.jpg}
 
-VOCAB: hard
 Narrator: There were two chairs in the room. One was a nice soft chair. The other was a hard chair. {st-page_128_003.jpg}
 
 VOCAB: to take a bath