-er -ol -up b-p b-u bbb bbc bbe bbf bbk bbl bbo bbp bbr bbt bbu bcb bcc bce bcf bck bcl bco bcp bcr bct bcu be- beb bec bee bef bek bel beo bep ber bet beu bfb bfc bfe bff bfl bfo bfp bfr bft bfu bkb bkc bke bkf bkk bkl bko bkp bkr bkt blb blc ble blf blk bll blo blp blr blt blu bob boc boe bof bok bol boo bop bor bot bou bpb bpc bpe bpf bpl bpo bpp bpr bpt bpu brb bre brf brk brl bro brp brr brt bru btb btc bte btf btk btl bto btp btr btt btu bub buc bue buf buk bul buo bup bur but buu c-- cbb cbc cbe cbf cbk cbl cbo cbp cbr cbt cbu ccb ccc cce ccf cck ccl cco ccp ccr cct ccu ce- ceb cec cee cef cek cel ceo cep cer cet ceu cfb cfc cfe cff cfk cfl cfo cfp cfr cft cfu ckb ckc cko ckt cl- clb clc cle clf clk cll clo clp clr clt clu co- cob coc coe cof cok col coo cop cor cot cou cpb cpc cpe cpf cpk cpl cpo cpp cpr cpt cpu crb crc cre crf crk crl cro crp crr crt cru ctb ctc cte ctf ctk ctl cto ctp ctr ctt ctu cub cuc cue cuf cuk cul cuo cup cur cut cuu ebb ebc ebe ebf ebk ebl ebo ebp ebr ebt ebu ec- ecb ecc ece ecf eck ecl eco ecr ect ecu eeb eec eee eef eek eel eeo eep eer eet ef- efb efc efe eff efl efo efp efr eft ekb ekc eke ekf ekl eko ekp ekr ekt eku elb elc ele elf elk ell elo elp elr elt elu eo- eob eoc eoe eof eok eol eoo eop eor eot eou ep- epb epc epe epf epl epo epp epr ept epu erb erc ere erf erk erl ero erp err ert eru etb etc ete etf etk etl eto etp etr ett etu eu- eub euc eue euf eul eup eur eut fbb fbc fbe fbf fbk fbl fbo fbp fbr fbt fbu fcb fcc fce fcf fck fcl fco fcp fcr fct fcu feb fec fee fef fek fel feo fep fer fet feu ffc ffe fff ffk ffl ffo ffp ffr fft ffu fkb fkc fkf fkk fkl fkp fkt flb flc fle flf fll flo flp flr flt flu fob foc foe fof fok fol foo fop for fot fou fpb fpc fpe fpk fpl fpo fpp fpr fpt fpu frb frc fre frf frk frl fro frp frr frt fru ftb ftc fte ftf ftk ftl fto ftp ftr ftt ftu fub fue fuf fuk ful fuo fup fur fut fuu k-t kbb kbc kbe kbf kbk kbl kbo kbp kbr kbu kcb kcc kce kck kcl kcp kcr kct kcu ke- keb kec kee kef kek kel keo kep ker ket kfc kff kfo kfu kkb kkc kke kkk kkl kkp kkr kkt kku kl- klb klc klf klo klr klt klu kob koc koe kof kok kol koo kop kor kot kou kpc kpe kpf kpk kpl kpo kpp kpr kpt kpu krc krf krk krl kro krp krr krt kru ktb ktc kte ktf ktk ktl kto ktp ktr ktt ktu kub kuc kue kuk kul kup kur kut kuu l-p lbb lbc lbe lbf lbk lbl lbo lbp lbr lbt lbu lcb lcc lce lcf lck lcl lco lcp lcr lct lcu leb lec lee lef lek lel leo lep ler let leu lfb lfc lfe lff lfk lfl lfo lfp lfr lft lfu lkb lkl lkp lkr lkt llb llc lle llf llk lll llo llp llr llt llu lob loc loe lof lok lol loo lop lor lot lou lpb lpc lpe lpf lpk lpl lpo lpp lpr lpt lpu lrb lrc lrf lrk lro lrp lrr lrt lru ltb ltc lte ltf ltk ltl lto ltp ltr ltt ltu lub luc lue luf luk lul luo lup lur lut luu ob- obb obc obe obf obk obl obo obp obr obt obu oc- ocb occ ocf ock ocl oco ocp ocr oct ocu oeb oec oee oef oel oeo oep oer oet of- ofb ofc ofe off ofl ofo ofp ofr oft ofu okb okc oke okk okl oko okp okr oku olb olc ole olf olk oll olo olp olt olu oo- oob ooc oof ook ool ooo oop oor oot op- opb opc ope opf opk opl opo opp opr opt or- orb orc ore orf ork orl oro orp orr ort oru ot- otb otc ote otf otk otl oto otp otr ott otu ou- ouc oue ouf ouk oul ouo oup our out p-p pbb pbc pbe pbf pbk pbl pbo pbp pbr pbt pbu pcb pcc pce pcf pck pcl pco pcp pcr pct pcu peb pec pee pef pek pel peo pep per pet peu pfb pfc pfe pff pfk pfl pfo pfp pfr pft pfu pkb pkc pke pkf pkl pko pkp pkr pkt pku plb plc ple plf plk pll plo plp plr plt plu pob poc poe pof pok pol poo pop por pot pou ppb ppc ppe ppf ppk ppl ppo ppp ppr ppt ppu prb prc pre prf prk prl pro prp prr prt pru pt- ptb ptc pte ptf ptk ptl pto ptp ptr ptt ptu pub puc pue puf puk pul pup pur put puu rbb rbc rbe rbf rbk rbl rbo rbp rbr rbt rbu rcb rcc rce rcf rcl rco rcp rcr rct rcu re- reb rec ree ref rek rel reo rep rer ret reu rfb rfc rfe rff rfk rfl rfo rfp rfr rft rfu rkb rkc rke rkf rkk rko rkp rkt rku rlc rle rlf rll rlo rlp rlr rlt rlu rob roc roe rof rok rol roo rop ror rot rou rpb rpc