calla aclla clala lcala alcla lacla calla aclla clala lcala alcla lacla cllaa lclaa cllaa lclaa llcaa llcaa allca lalca allca lalca llaca llaca calal aclal claal lcaal alcal lacal caall acall caall acall aacll aacll claal lcaal calal aclal lacal alcal alacl laacl aalcl aalcl laacl alacl calal aclal claal lcaal alcal lacal caall acall caall acall aacll aacll claal lcaal calal aclal lacal alcal alacl laacl aalcl aalcl laacl alacl cllaa lclaa cllaa lclaa llcaa llcaa clala lcala calla aclla lacla alcla clala lcala calla aclla lacla alcla llaca llaca lalca allca lalca allca allac lalac allac lalac llaac llaac alalc laalc aallc aallc laalc alalc alalc laalc aallc aallc laalc alalc llaac llaac lalac allac lalac allac
Note: these 'words' (valid or invalid) are all the permutations of the word calla. These words are obtained by scrambling the letters in calla.