b-p bbb bbe bbi bbk bbo bbp bbs bbt be- beb bee bei bek beo bep bes bet bi- bib bie bii bik bio bip bis bit bkb bke bkk bko bkp bks bkt bob boe boi bok boo bop bos bot bpb bpe bpi bpo bpp bps bpt bsb bse bsi bsk bso bsp bss bst btb bte bti btk bto btp bts btt ebb ebe ebi ebk ebo ebp ebs ebt eeb eee eek eeo eep ees eet eib eie eii eik eio eip eis eit ekb eke eki eko ekp eks ekt eo- eob eoe eoi eok eoo eop eos eot ep- epb epe epi epo epp eps ept es- esb ese esi esk eso esp ess est etb ete eti etk eto etp ets ett ibb ibe ibi ibk ibo ibp ibs ibt ie- iee iei iek iep ies iet iib iie iii iio iip iis iit ikb ike iki ikk iko iks ikt io- iob ioe ioi ioo iop ios iot ipb ipe ipi ipo ipp ips ipt is- isb ise isi isk iso isp iss ist itb ite iti itk ito itp its itt k-t kbb kbe kbi kbk kbo kbp kbs ke- keb kee kei kek keo kep kes ket kib kie kii kik kio kip kis kit kkb kke kki kkk kkp kks kkt kob koe koi kok koo kop kos kot kpe kpi kpk kpo kpp kps kpt ksb kse ksi ksk kso ksp kss kst ktb kte ktk kto ktp kts ktt o-i ob- obb obe obi obk obo obp obs obt oeb oee oei oeo oep oes oet oib oie oii oik oio oip ois oit okb oke oki okk oko okp oks oo- oob ooi ook ooo oop oos oot op- opb ope opi opk opo opp ops opt os- osb ose osi osk oso osp oss ost ot- otb ote oti otk oto otp ots ott p-p pbb pbe pbi pbk pbo pbp pbs pbt peb pee pei pek peo pep pes pet pib pie pii pik pio pip pis pit pkb pke pki pko pkp pks pkt pob poe poi pok poo pop pos pot ppb ppe ppi ppk ppo ppp pps ppt ps- psb pse psi psk pso psp pss pst pt- ptb pte pti ptk pto ptp pts ptt sbb sbe sbi sbk sbo sbp sbs sbt se- seb see sei sek seo sep ses set sib sie sii sik sio sip sis sit sk- skb ske ski skk sko skp sks skt sob soe soi sok soo sop sos sot spb spe spi spk spo spp sps spt ss- ssb sse ssi ssk sso ssp sss sst stb ste sti stk sto stp sts stt tbb tbe tbi tbk tbo tbp tbs tbt te- teb tee tei tek teo tep tes tet tib tie tii tik tio tip tis tit tkb tke tkk tko tkp tks tkt to- tob toe toi tok too top tos tot tpb tpe tpi tpk tpo tpp tps tpt tsb tse tsi tsk tso tsp tss tst ttb tte tti ttk tto ttp tts ttt