-er -up b-p b-u bbb bbe bbo bbp bbr bbs bbt bbu bbx be- beb bee beo bep ber bes bet beu bex bob boe boo bop bor bos bot bou box bpb bpe bpo bpp bpr bps bpt bpu bpx brb bre bro brp brr brs brt bru brx bsb bse bso bsp bsr bss bst bsu bsx btb bte bto btp btr bts btt btu btx bub bue buo bup bur bus but buu bux bxb bxo bxx ebb ebe ebo ebp ebr ebs ebt ebu ebx eeb eee eeo eep eer ees eet eex eo- eob eoe eoo eop eor eos eot eou ep- epb epe epo epp epr eps ept epu epx erb ere ero erp err ers ert eru es- esb ese eso esp esr ess est esu esx etb ete eto etp etr ets ett etu etx eu- eub eue eup eur eus eut eux ex- exe exo exp exr exs ext exu exx ob- obb obe obo obp obr obs obt obu obx oeb oee oeo oep oer oes oet oex oo- oob ooo oop oor oos oot oox op- opb ope opo opp opr ops opt opx or- orb ore oro orp orr ors ort oru orx os- osb ose oso osp osr oss ost osu osx ot- otb ote oto otp otr ots ott otu ou- oue ouo oup our ous out ox- oxb oxo oxt oxx p-p pbb pbe pbo pbp pbr pbs pbt pbu pbx peb pee peo pep per pes pet peu pex pob poe poo pop por pos pot pou pox ppb ppe ppo ppp ppr pps ppt ppu ppx prb pre pro prp prr prs prt pru prx ps- psb pse pso psp psr pss pst psu psx pt- ptb pte pto ptp ptr pts ptt ptu ptx pub pue pup pur pus put puu pxe pxr pxs pxt rbb rbe rbo rbp rbr rbs rbt rbu rbx re- reb ree reo rep rer res ret reu rex rob roe roo rop ror ros rot rou rox rpb rpe rpo rpp rpr rps rpt rpu rpx rrb rrp rrr rrs rrt rru rsb rse rso rsp rsr rss rst rsu rsx rtb rte rto rtp rtr rts rtt rtu rtx rub rue ruo rup rur rus rut ruu rux rxp rxr rxs sbb sbe sbo sbp sbr sbs sbt sbu sbx se- seb see seo sep ser ses set seu sex sob soe soo sop sor sos sot sou sox spb spe spo spp spr sps spt spu spx sr- srb sre sro srp srr srs srt srx ss- ssb sse sso ssp ssr sss sst ssu ssx stb ste sto stp str sts stt stu stx sub sue suo sup sur sus sut suu sux sxs sxt sxu t-x tbb tbe tbo tbp tbr tbs tbt tbu te- teb tee teo tep ter tes tet teu tex to- tob toe too top tor tos tot tou tox tpb tpe tpo tpp tpr tps tpt tpu tpx trb tre tro trp trr trs trt tru trx tsb tse tso tsp tsr tss tst tsu tsx ttb tte tto ttp ttr tts ttt ttu ttx tub tue tuo tup tur tus tut tuu tux txe txs txt txu ubb ube ubo ubp ubr ubs ubt ubu ubx ueb uee uep uer ues uet uob uoe uoo uop uor uos uot uox up- upb upe upo upp upr ups upt upu upx ur- urb ure uro urp urr urs urt uru urx usb use uso usp usr uss ust usu usx utb ute uto utp utr uts utt utu utx uue uur uus uut uuu uxb uxo uxr uxt uxu xbe xbr xbx xee xep xer xes xet xeu xex xoo xop xor xos xot xox xpb xpe xpo xpp xps xpt xrt xrx xsb xsp xss xst xtp xtr xts xtx xue xup xus xxo xxp xxx