a-a a-b a-i aaa aab aai aan aao aar aas aav ab- aba abb abi abn abo abr abs abv ai- aia aib aii ain aio air ais aiv an- ana anb ani ann ano anr ans anv aoa aob aoi aon aoo aor aos aov ar- ara arb ari arn aro arr ars arv as- asa asb asi asn aso asr ass asv av- ava avb avi avn avo avr avs baa bab bai ban bao bar bas bav bba bbb bbi bbn bbo bbr bbs bi- bia bib bii bin bio bir bis biv bna bnb bni bnn bno bnr bns bnv boa bob boi bon boo bor bos bov bra brb bri brn bro brr brs brv bsa bsb bsi bsn bso bsr bss bsv bva bvb bvi bvn bvo bvr bvs bvv i-v ia- iaa iab iai ian iao iar ias iav iba ibb ibi ibn ibo ibr ibs ibv iia iib iii iin iio iir iis in- ina inb ini inn ino inr ins inv io- ioa iob ioi ion ioo ior ios iov ir- ira irb iri irn iro irr irs irv is- isa isb isi isn iso isr iss isv iva ivb ivi ivo ivr ivs ivv n-i naa nab nai nan nao nar nas nav nba nbb nbi nbn nbo nbr nbs nbv nia nib nii nin nio nir nis niv nna nnb nni nnn nno nns nnv no- noa nob noi non noo nor nos nov nra nrb nri nrn nro nrr nrs nrv nsa nsb nsi nsn nso nsr nss nsv nva nvb nvi nvn nvv o-i oaa oab oai oan oao oar oas oav ob- oba obb obi obn obo obr obs obv oia oib oii oin oio oir ois oiv on- ona onb oni onn ono onr ons oo- ooa oob ooi oon ooo oor oos oov or- ora orb ori orn oro orr ors orv os- osa osb osi osn oso osr oss osv ov- ova ovb ovi ovo ovs ovv ra- raa rab rai ran rao rar ras rav rba rbb rbi rbn rbo rbr rbs ria rib rii rin rio rir ris riv rna rnb rni rnn rno rnr rns rnv roa rob roi ron roo ror ros rov rra rrb rri rrn rrr rrs rsa rsb rsi rsn rso rsr rss rsv rva rvb rvi rvn rvo rvr rvs rvv saa sab sai san sao sar sas sav sba sbb sbi sbn sbo sbr sbs sbv sia sib sii sin sio sir sis siv sna snb sni snn sno snr sns snv soa sob soi son soo sor sos sov sr- sra srb sri srn sro srr srs srv ss- ssa ssb ssi ssn sso ssr sss ssv sva svb svi svn svo svr svs svv v-a vaa vab vai van vao var vas vav vba vbi vbo vbr vbs vbv vi- via vib vii vin vio vir vis viv vn- vna vni vno vnr vns vnv voa vob voi von voo vor vos vov vra vrb vri vrn vrr vrs vsa vsb vsi vsn vso vsr vss vsv vva vvb vvi vvo vvr vvs vvv