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Use "flyleaves" in a sentence
"You can write stuff in the front flyleaves and give them to people as presents."
"You can get the author to write stuff in the front flyleaves and keep them for yourself."
"But in a feat of inspired scholarship, Duffy has turned to the very features of these books that have rankled those who study them as works of art: the jottings in the margins and on the flyleaves made by their owners, hitherto regarded as defacements at worst and proof of provenance at best."