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Use "thumbprints" in a sentence
"Biometrics such as thumbprints show some promise here, but bring with them their own set of exploitable failure modes."
"My religion requires a Spiderman outfit be worn in public ... arachnid "thumbprints" included."
"Anyway, the security at the border was pretty tight after he fleed (I believe he also threw spare rolls of toilet paper out the window before he jumped, to help cushion his fall), and everyone had to submit thumbprints via an electronic reader, ostensibly to check against the thumbprints of Mas Selamat that Singapore had on record."