-er b-p bbb bbe bbi bbn bbo bbp bbr bbs be- beb bee bei ben beo bep ber bes bev bi- bib bie bii bin bio bip bir bis biv bnb bne bni bnn bno bnp bnr bns bnv bob boe boi bon boo bop bor bos bov bpb bpe bpi bpn bpo bpp bpr bps bpv brb bre bri brn bro brp brr brs brv bsb bse bsi bsn bso bsp bsr bss bsv bvb bve bvi bvn bvo bvp bvr bvs bvv ebb ebe ebi ebn ebo ebp ebr ebs ebv eeb eee een eeo eep eer ees eev eib eie eii ein eio eip eir eis eiv en- enb ene eni enn eno enp enr ens env eo- eob eoe eoi eon eoo eop eor eos ep- epb epe epi epn epo epp epr eps erb ere eri ern ero erp err ers erv es- esb ese esi esn eso esp esr ess esv evb eve evi evn evo evp evr evs evv i-v ibb ibe ibi ibn ibo ibp ibr ibs ibv ie- iee iei ien iep ier ies iev iib iie iii iin iio iip iir iis in- inb ine ini inn ino inp inr ins inv io- iob ioe ioi ion ioo iop ior ios iov ipb ipe ipi ipn ipo ipp ipr ips ipv ir- irb ire iri irn iro irp irr irs irv is- isb ise isi isn iso isp isr iss isv ivb ive ivi ivo ivp ivr ivs ivv n-i nbb nbe nbi nbn nbo nbp nbr nbs nbv ne- neb nee nei nen neo nep ner nes nev nib nie nii nin nio nip nir nis niv nnb nne nni nnn nno nnp nns nnv no- nob noe noi non noo nop nor nos nov npb npe npi npn npo npp npr nps npv nrb nre nri nrn nro nrp nrr nrs nrv nsb nse nsi nsn nso nsp nsr nss nsv nvb nve nvi nvn nvp nvv o-i ob- obb obe obi obn obo obp obr obs obv oeb oee oei oen oeo oep oer oes oib oie oii oin oio oip oir ois oiv on- onb one oni onn ono onp onr ons oo- oob ooi oon ooo oop oor oos oov op- opb ope opi opn opo opp opr ops opv or- orb ore ori orn oro orp orr ors orv os- osb ose osi osn oso osp osr oss osv ov- ovb ove ovi ovo ovp ovs ovv p-p pbb pbe pbi pbn pbo pbp pbr pbs peb pee pei pen peo pep per pes pev pib pie pii pin pio pip pir pis piv pn- pnb pne pni pnn pno pnp pnr pns pnv pob poe poi pon poo pop por pos pov ppb ppe ppi ppn ppo ppp ppr pps ppv prb pre pri prn pro prp prr prs prv ps- psb pse psi psn pso psp psr pss psv pvb pve pvi pvn pvo pvp pvr pvs pvv rbb rbe rbi rbn rbo rbp rbr rbs re- reb ree rei ren reo rep rer res rev rib rie rii rin rio rip rir ris riv rnb rni rnn rno rnp rnr rns rnv rob roe roi ron roo rop ror ros rov rpb rpe rpi rpn rpo rpp rpr rps rpv rrb rri rrn rrp rrr rrs rsb rse rsi rsn rso rsp rsr rss rsv rvb rve rvi rvn rvo rvp rvr rvs rvv sbb sbe sbi sbn sbo sbp sbr sbs sbv se- seb see sei sen seo sep ser ses sev sib sie sii sin sio sip sir sis siv snb sne sni snn sno snp snr sns snv sob soe soi son soo sop sor sos sov spb spe spi spn spo spp spr sps spv sr- srb sre sri srn sro srp srr srs srv ss- ssb sse ssi ssn sso ssp ssr sss ssv svb sve svi svn svo svp svr svs svv v-e vbi vbo vbr vbs vbv veb vee vei ven veo vep ver ves vi- vib vie vii vin vio vip vir vis viv vn- vni vno vnp vnr vns vnv vob voe voi von voo vop vor vos vov vpb vpe vpi vpn vpo vpp vpr vps vrb vre vri vrn vrp vrr vrs vsb vse vsi vsn vso vsp vsr vss vsv vvb vvi vvo vvr vvs vvv