a-ak aaaa aaac aaae aaca aacc aace aack aaea aaec aaka aake acaa acac acae acca accc acce ace- acea acec acek acke aeac aeka akaa akae akca akee akka caaa caac cac- caca cacc cace cack caec caka cake ccaa ccac ccca cccc ccee ceac cec- ceca cece ceec ceke ckac ckck eaca eacc eaec ecaa ecac ecca eccc ecce ecka eeca eeea eeee eeka eeke eka- ekek ekka kaaa kaak kacc kace kaka kakc kake kakk kcaa kcac kcca kccc kcck kcea kcec kcee kckc kckk kea- keak keca keck keek keka kekc keke kkaa kkac kkck kkea kkkk