None, there is no such letters in the English language.
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Some words containing k, g, w:knowingtweakingwakingwalkingwhackingwinking
4 Letter Scrabble Wordsdampdarkdrammarkpardparkpramramp3 Letter Scrabble Wordsamparkarmdakdamdapmadmapmarpadpamparradramrap2 Letter Scrabble Wordsadamarkamapa
Bookkeeper and jackknife are words. They contain the letters kk.
fog, keg, feik, and of are all i can think of...
vikingskivingknaveskiveskivedevokeevokedevokes