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Use "keycodes" in a sentence
"Youth Enrichment Services says despite the added security step, checking in children isn't a hassle because punching in the keycodes is a faster process than before."
"Hardline Muslim recruits are often given passwords and keycodes to terrorism sites via internet chatrooms, although sometimes they come from sympathisers in local mosques."
"A keylogger will give you a huge dump of keycodes, which you can translate into characters."