a-a a-b aaa aab aan aar aas aav ab- aba abb abn abr abs abv an- ana anb ann anr ans anv ar- ara arb arn arr ars arv as- asa asb asn asr ass asv av- ava avb avn avr avs baa bab ban bar bas bav bba bbb bbn bbr bbs bna bnb bnn bnr bns bnv bra brb brn brr brs brv bsa bsb bsn bsr bss bsv bva bvb bvn bvr bvs bvv naa nab nan nar nas nav nba nbb nbn nbr nbs nbv nna nnb nnn nns nnv nra nrb nrn nrr nrs nrv nsa nsb nsn nsr nss nsv nva nvb nvn nvv ra- raa rab ran rar ras rav rba rbb rbn rbr rbs rna rnb rnn rnr rns rnv rra rrb rrn rrr rrs rsa rsb rsn rsr rss rsv rva rvb rvn rvr rvs rvv saa sab san sar sas sav sba sbb sbn sbr sbs sbv sna snb snn snr sns snv sr- sra srb srn srr srs srv ss- ssa ssb ssn ssr sss ssv sva svb svn svr svs svv v-a vaa vab van var vas vav vba vbr vbs vbv vn- vna vnr vns vnv vra vrb vrn vrr vrs vsa vsb vsn vsr vss vsv vva vvb vvr vvs vvv