a-a a-b a-c aaa aab aac aaj aan aao aar aav ab- aba abb abc abj abn abo abr abv ac- aca acb acc acj acn aco acr acv aja ajb ajc ajj ajn ajo ajr an- ana anb anc anj ann ano anr anv aoa aob aoc aoj aon aoo aor aov ar- ara arb arc arj arn aro arr arv av- ava avb avc avn avo avr baa bab bac baj ban bao bar bav bba bbb bbc bbn bbo bbr bca bcb bcc bcj bcn bco bcr bcv bja bjc bjj bjn bjr bna bnb bnc bnj bnn bno bnr bnv boa bob boc boj bon boo bor bov bra brb brj brn bro brr brv bva bvb bvc bvn bvo bvr bvv c-- c-j caa cab cac caj can cao car cav cba cbb cbc cbj cbn cbo cbr cbv cca ccb ccc ccj ccn cco ccr ccv cja cjb cjc cjr cn- cna cnb cnc cnj cnn cno cnr cnv co- coa cob coc coj con coo cor cov cra crb crc crj crn cro crr crv cva cvb cvc cvn cvo cvr cvv jaa jab jac jaj jan jao jar jav jba jbc jbj jbo jbr jca jcb jcc jco jcr jja jjb jjc jjj jjr jna jnc jnj jnn jno jnr joa job joc joj jon joo jor jra jrb jrc jrn jro jrr jvb jvc jvn naa nab nac naj nan nao nar nav nba nbb nbc nbn nbo nbr nbv nca ncb ncc ncn nco ncr ncv nja njc njn nna nnb nnc nnn nno nnv no- noa nob noc noj non noo nor nov nra nrb nrc nrj nrn nro nrr nrv nva nvb nvc nvn nvv oaa oab oac oaj oan oao oar oav ob- oba obb obc obj obn obo obr obv oc- oca ocb occ ocj ocn oco ocr ocv oja ojb ojc ojo on- ona onb onc onj onn ono onr oo- ooa oob ooc oon ooo oor oov or- ora orb orc orn oro orr orv ov- ova ovb ovc ovo ovv ra- raa rab rac raj ran rao rar rav rba rbb rbc rbn rbo rbr rca rcb rcc rcj rcn rco rcr rcv rja rjc rjr rna rnb rnc rnn rno rnr rnv roa rob roc roj ron roo ror rov rra rrb rrc rrn rrr rva rvb rvc rvn rvo rvr rvv v-a vaa vab vac vaj van vao var vav vba vbc vbo vbr vbv vca vcc vcn vco vcr vja vn- vna vnj vno vnr vnv voa vob voc von voo vor vov vra vrb vrc vrn vrr vva vvb vvc vvo vvr vvv