a-a a-b a-c aaa aab aac aan aar aav aay ab- aba abb abc abn abr abv aby ac- aca acb acc acn acr acv acy an- ana anb anc ann anr anv any ar- ara arb arc arn arr arv ary av- ava avb avc avn avr avy ay- aya ayc ayn ayr baa bab bac ban bar bav bay bba bbb bbc bbn bbr bby bca bcb bcc bcn bcr bcv bcy bna bnb bnc bnn bnr bnv bra brb brn brr brv bry bva bvb bvc bvn bvr bvv by- bya byc byn byr c-- caa cab cac can car cav cay cba cbb cbc cbn cbr cbv cby cca ccb ccc ccn ccr ccv cn- cna cnb cnc cnn cnr cnv cny cra crb crc crn crr crv cry cva cvb cvc cvn cvr cvv cya cyb cyc cyn cyr naa nab nac nan nar nav nay nba nbb nbc nbn nbr nbv nca ncb ncc ncn ncr ncv nna nnb nnc nnn nnv nra nrb nrc nrn nrr nrv nry nva nvb nvc nvn nvv nya nyc nyn nyy ra- raa rab rac ran rar rav ray rba rbb rbc rbn rbr rca rcb rcc rcn rcr rcv rna rnb rnc rnn rnr rnv rny rra rrb rrc rrn rrr rva rvb rvc rvn rvr rvv rvy ry- rya ryc ryn ryr ryy v-a vaa vab vac van var vav vay vba vbc vbr vbv vca vcc vcn vcr vcy vn- vna vnr vnv vra vrb vrc vrn vrr vry vva vvb vvc vvr vvv vyn yaa yab yac yan yar yav yay ybc ybr yby yca ycc ycv ycy yna ynn yny yra yrc yrn yva yvr yvy yyb yyc yyy