book-4-lesson-3: restore dropped can't-transform item (f5-06)

Now uses 387/387 cassette clips (100%).

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

book-4-lesson-3.module

@@ -845,6 +845,9 @@ RESPONSE: He can't play baseball well. {bk04-l3c-f5-04-a.mp3}
 PROMPT: Betty can drive a bus. Truck. {bk04-l3c-f5-05-q.mp3}
 RESPONSE: She can't drive a truck. {bk04-l3c-f5-05-a.mp3}
 
+PROMPT: Ed can come to class next week. Today. {bk04-l3c-f5-06-q.mp3}
+RESPONSE: He can't come to class today. {bk04-l3c-f5-06-a.mp3}
+
 # Source: ST §Can You Play Baseball?
 $DIALOGUE Can You Play Baseball?
 INTRO: A teacher asks around the class who can play baseball. Listen and repeat.