a-a a-c aaa aac aak aan aao aav ac- aca acc ack acn aco acv aka akc akk akn ako akv an- ana anc ank ann ano anv aoa aoc aok aon aoo aov av- ava avc avk avn avo c-- caa cac cak can cao cav cca ccc cck ccn cco ccv cka ckc cko cn- cna cnc cnn cno cnv co- coa coc cok con coo cov cva cvc cvk cvn cvo cvv ka- kaa kac kak kan kao kav kca kcc kck kcn kkc kkk kkn kkv kn- kna knc knk knn kno koa koc kok kon koo kva kvk kvn kvo kvv naa nac nak nan nao nav nca ncc nck ncn nco ncv nka nkc nkk nkn nko nna nnc nnk nnn nno nnv no- noa noc nok non noo nov nva nvc nvk nvn nvv oaa oac oak oan oao oav oc- oca occ ock ocn oco ocv oka okc okk oko on- ona onc onk onn ono oo- ooa ooc ook oon ooo oov ov- ova ovc ovo ovv v-a vaa vac vak van vao vav vca vcc vcn vco vka vn- vna vno vnv voa voc vok von voo vov vva vvc vvo vvv