-er b-p bbb bbe bbf bbi bbk bbo bbp bbr bbt be- beb bee bef bei bek beo bep ber bet bfb bfe bff bfi bfo bfp bfr bft bi- bib bie bif bii bik bio bip bir bit bkb bke bkf bkk bko bkp bkr bkt bob boe bof boi bok boo bop bor bot bpb bpe bpf bpi bpo bpp bpr bpt brb bre brf bri brk bro brp brr brt btb bte btf bti btk bto btp btr btt ebb ebe ebf ebi ebk ebo ebp ebr ebt eeb eee eef eek eeo eep eer eet ef- efb efe eff efi efo efp efr eft eib eie eif eii eik eio eip eir eit ekb eke ekf eki eko ekp ekr ekt eo- eob eoe eof eoi eok eoo eop eor eot ep- epb epe epf epi epo epp epr ept erb ere erf eri erk ero erp err ert etb ete etf eti etk eto etp etr ett fbb fbe fbf fbi fbk fbo fbp fbr fbt feb fee fef fei fek feo fep fer fet ffe fff ffi ffk ffo ffp ffr fft fib fie fif fii fik fip fir fit fkb fkf fki fkk fkp fkt fob foe fof foi fok foo fop for fot fpb fpe fpi fpk fpo fpp fpr fpt frb fre frf fri frk fro frp frr frt ftb fte ftf fti ftk fto ftp ftr ftt i-f ibb ibe ibf ibi ibk ibo ibp ibr ibt ie- iee ief iei iek iep ier iet ifb ife iff ifi ifo ifp ifr ift iib iie iif iii iio iip iir iit ikb ike ikf iki ikk iko ikr ikt io- iob ioe iof ioi ioo iop ior iot ipb ipe ipf ipi ipo ipp ipr ipt ir- irb ire irf iri irk iro irp irr irt itb ite itf iti itk ito itp itt k-t kbb kbe kbf kbi kbk kbo kbp kbr ke- keb kee kef kei kek keo kep ker ket kff kfi kfo kib kie kif kii kik kio kip kir kit kkb kke kki kkk kkp kkr kkt kob koe kof koi kok koo kop kor kot kpe kpf kpi kpk kpo kpp kpr kpt krf kri krk kro krp krr krt ktb kte ktf ktk kto ktp ktr ktt o-i ob- obb obe obf obi obk obo obp obr obt oeb oee oef oei oeo oep oer oet of- ofb ofe off ofi ofo ofp ofr oft oib oie oif oii oik oio oip oir oit okb oke oki okk oko okp okr oo- oob oof ooi ook ooo oop oor oot op- opb ope opf opi opk opo opp opr opt or- orb ore orf ori ork oro orp orr ort ot- otb ote otf oti otk oto otp otr ott p-p pbb pbe pbf pbi pbk pbo pbp pbr pbt peb pee pef pei pek peo pep per pet pfb pfe pff pfi pfk pfo pfp pfr pft pib pie pif pii pik pio pip pir pit pkb pke pkf pki pko pkp pkr pkt pob poe pof poi pok poo pop por pot ppb ppe ppf ppi ppk ppo ppp ppr ppt prb pre prf pri prk pro prp prr prt pt- ptb pte ptf pti ptk pto ptp ptr ptt rbb rbe rbf rbi rbk rbo rbp rbr rbt re- reb ree ref rei rek reo rep rer ret rfb rfe rff rfi rfk rfo rfp rfr rft rib rie rif rii rik rio rip rir rit rkb rke rkf rkk rko rkp rkt rob roe rof roi rok roo rop ror rot rpb rpe rpf rpi rpk rpo rpp rpr rpt rrb rrf rri rrk rrp rrr rrt rtb rte rtf rti rtk rto rtp rtr rtt tbb tbe tbf tbi tbk tbo tbp tbr tbt te- teb tee tef tei tek teo tep ter tet tfb tfe tff tfi tfk tfo tfp tfr tft tib tie tif tii tik tio tip tir tit tkb tke tkk tko tkp tkr tkt to- tob toe tof toi tok too top tor tot tpb tpe tpf tpi tpk tpo tpp tpr tpt trb tre trf tri trk tro trp trr trt ttb tte ttf tti ttk tto ttp ttr ttt