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% replaces any number of letters (la% - lake, lamp)_ replaces one letter (ca_ - car, cat)

Crossword clues for Textbook section:

UNIT: Textbook section
CHAPTER: Textbook section
ERAS: History textbook sections
INDEX: Textbook section
LESSON: Textbook section
SPINE: Hard section of a textbook, perhaps
UNITTEST: Exam on a section of the textbook, say
UNIT: Section of a textbook