-er bbb bbe bbi bbk bbn bbo bbr bbs be- beb bee bei bek ben beo ber bes bev bi- bib bie bii bik bin bio bir bis biv bkb bke bkk bkn bko bkr bks bkv bnb bne bni bnk bnn bno bnr bns bnv bob boe boi bok bon boo bor bos bov brb bre bri brk brn bro brr brs brv bsb bse bsi bsk bsn bso bsr bss bsv bvb bve bvi bvk bvn bvo bvr bvs bvv ebb ebe ebi ebk ebn ebo ebr ebs ebv eeb eee eek een eeo eer ees eev eib eie eii eik ein eio eir eis eiv ekb eke eki eko ekr eks ekv en- enb ene eni enk enn eno enr ens env eo- eob eoe eoi eok eon eoo eor eos erb ere eri erk ern ero err ers erv es- esb ese esi esk esn eso esr ess esv evb eve evi evn evo evr evs evv i-v ibb ibe ibi ibk ibn ibo ibr ibs ibv ie- iee iei iek ien ier ies iev iib iie iii iin iio iir iis ikb ike iki ikk iko ikr iks ikv in- inb ine ini ink inn ino inr ins inv io- iob ioe ioi ion ioo ior ios iov ir- irb ire iri irk irn iro irr irs irv is- isb ise isi isk isn iso isr iss isv ivb ive ivi ivo ivr ivs ivv kbb kbe kbi kbk kbn kbo kbr kbs ke- keb kee kei kek ken keo ker kes kev kib kie kii kik kin kio kir kis kiv kkb kke kki kkk kkn kkr kks kkv kn- kne kni knk knn kno knr kob koe koi kok kon koo kor kos kri krk krn kro krr krs krv ksb kse ksi ksk ksn kso ksr kss ksv kvb kvi kvk kvn kvo kvr kvs kvv n-i nbb nbe nbi nbk nbn nbo nbr nbs nbv ne- neb nee nei nek nen neo ner nes nev nib nie nii nik nin nio nir nis niv nke nki nkk nkn nko nkr nks nnb nne nni nnk nnn nno nns nnv no- nob noe noi nok non noo nor nos nov nrb nre nri nrk nrn nro nrr nrs nrv nsb nse nsi nsk nsn nso nsr nss nsv nvb nve nvi nvk nvn nvv o-i ob- obb obe obi obk obn obo obr obs obv oeb oee oei oen oeo oer oes oib oie oii oik oin oio oir ois oiv okb oke oki okk oko okr oks on- onb one oni onk onn ono onr ons oo- oob ooi ook oon ooo oor oos oov or- orb ore ori ork orn oro orr ors orv os- osb ose osi osk osn oso osr oss osv ov- ovb ove ovi ovo ovs ovv rbb rbe rbi rbk rbn rbo rbr rbs re- reb ree rei rek ren reo rer res rev rib rie rii rik rin rio rir ris riv rkb rke rkk rko rks rkv rnb rni rnn rno rnr rns rnv rob roe roi rok ron roo ror ros rov rrb rri rrk rrn rrr rrs rsb rse rsi rsk rsn rso rsr rss rsv rvb rve rvi rvn rvo rvr rvs rvv sbb sbe sbi sbk sbn sbo sbr sbs sbv se- seb see sei sek sen seo ser ses sev sib sie sii sik sin sio sir sis siv sk- skb ske ski skk sko skr sks snb sne sni snk snn sno snr sns snv sob soe soi sok son soo sor sos sov sr- srb sre sri srk srn sro srr srs srv ss- ssb sse ssi ssk ssn sso ssr sss ssv svb sve svi svk svn svo svr svs svv v-e vbi vbk vbo vbr vbs vbv veb vee vei vek ven veo ver ves vi- vib vie vii vik vin vio vir vis viv vkb vn- vni vno vnr vns vnv vob voe voi vok von voo vor vos vov vrb vre vri vrk vrn vrr vrs vsb vse vsi vsk vsn vso vsr vss vsv vvb vvi vvo vvr vvs vvv