a-a a-c aaa aac aap aav aay ac- aca acc acp acv acy ap- apa apc app apv apy av- ava avc avp avy ay- aya ayc ayp c-- caa cac cap cav cay cca ccc ccp ccv cpa cpc cpp cpv cva cvc cvp cvv cya cyc cyp p-p paa pac pap pav pay pca pcc pcp pcv ppa ppc ppp ppv pva pvc pvp pvv py- pya pyc v-a vaa vac vap vav vay vca vcc vcp vcy vpa vpc vpp vva vvc vvv vyp yaa yac yap yav yay yca ycc ycp ycv ycy ypa yva yvy yyc yyy