a-a a-c aaa aac aan aar aav ac- aca acc acn acr acv an- ana anc ann anr anv ar- ara arc arn arr arv av- ava avc avn avr c-- caa cac can car cav cca ccc ccn ccr ccv cn- cna cnc cnn cnr cnv cra crc crn crr crv cva cvc cvn cvr cvv naa nac nan nar nav nca ncc ncn ncr ncv nna nnc nnn nnv nra nrc nrn nrr nrv nva nvc nvn nvv ra- raa rac ran rar rav rca rcc rcn rcr rcv rna rnc rnn rnr rnv rra rrc rrn rrr rva rvc rvn rvr rvv v-a vaa vac van var vav vca vcc vcn vcr vn- vna vnr vnv vra vrc vrn vrr vva vvc vvr vvv