cauks acuks cuaks ucaks aucks uacks cakus ackus ckaus kcaus akcus kacus cukas uckas ckuas kcuas ukcas kucas aukcs uakcs akucs kaucs ukacs kuacs causk acusk cuask ucask aucsk uacsk casuk acsuk csauk scauk ascuk sacuk cusak ucsak csuak scuak uscak sucak ausck uasck asuck sauck usack suack caksu acksu ckasu kcasu akcsu kacsu casku acsku csaku scaku ascku sacku cksau kcsau cskau sckau kscau skcau akscu kascu askcu sakcu ksacu skacu cuksa ucksa ckusa kcusa ukcsa kucsa cuska ucska csuka scuka uscka sucka cksua kcsua cskua sckua kscua skcua uksca kusca uskca sukca ksuca skuca auksc uaksc akusc kausc ukasc kuasc auskc uaskc asukc saukc usakc suakc aksuc kasuc askuc sakuc ksauc skauc uksac kusac uskac sukac ksuac skuac
Note: these 'words' (valid or invalid) are all the permutations of the word cauks. These words are obtained by scrambling the letters in cauks.