yacka aycka ycaka cyaka acyka cayka yakca aykca ykaca kyaca akyca kayca yckaa cykaa ykcaa kycaa ckyaa kcyaa ackya cakya akcya kacya ckaya kcaya yacak aycak ycaak cyaak acyak cayak yaack ayack yaack ayack aayck aayck ycaak cyaak yacak aycak cayak acyak acayk caayk aacyk aacyk caayk acayk yakac aykac ykaac kyaac akyac kayac yaakc ayakc yaakc ayakc aaykc aaykc ykaac kyaac yakac aykac kayac akyac akayc kaayc aakyc aakyc kaayc akayc yckaa cykaa ykcaa kycaa ckyaa kcyaa ycaka cyaka yacka aycka cayka acyka ykaca kyaca yakca aykca kayca akyca ckaya kcaya cakya ackya kacya akcya ackay cakay akcay kacay ckaay kcaay acaky caaky aacky aacky caaky acaky akacy kaacy aakcy aakcy kaacy akacy ckaay kcaay cakay ackay kacay akcay
Note: these 'words' (valid or invalid) are all the permutations of the word yacka. These words are obtained by scrambling the letters in yacka.