Crosswordiee.com

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

Crossword clues for One of 20 in a book:

SAFETYMATCH: One of 20 in a book, typically
MATCH: One of 20 in many books
MATCH: One of 20 in a book
SAFETYMATCH: One of a book of 20, perhaps