b-p bbb bbe bbi bbo bbp bbs bbt be- beb bee bei beo bep bes bet bi- bib bie bii bio bip bis bit bob boe boi boo bop bos bot bpb bpe bpi bpo bpp bps bpt bsb bse bsi bso bsp bss bst btb bte bti bto btp bts btt ebb ebe ebi ebo ebp ebs ebt eeb eee eeo eep ees eet eib eie eii eio eip eis eit eo- eob eoe eoi eoo eop eos eot ep- epb epe epi epo epp eps ept es- esb ese esi eso esp ess est etb ete eti eto etp ets ett ibb ibe ibi ibo ibp ibs ibt ie- iee iei iep ies iet iib iie iii iio iip iis iit io- iob ioe ioi ioo iop ios iot ipb ipe ipi ipo ipp ips ipt is- isb ise isi iso isp iss ist itb ite iti ito itp its itt o-i ob- obb obe obi obo obp obs obt oeb oee oei oeo oep oes oet oib oie oii oio oip ois oit oo- oob ooi ooo oop oos oot op- opb ope opi opo opp ops opt os- osb ose osi oso osp oss ost ot- otb ote oti oto otp ots ott p-p pbb pbe pbi pbo pbp pbs pbt peb pee pei peo pep pes pet pib pie pii pio pip pis pit pob poe poi poo pop pos pot ppb ppe ppi ppo ppp pps ppt ps- psb pse psi pso psp pss pst pt- ptb pte pti pto ptp pts ptt sbb sbe sbi sbo sbp sbs sbt se- seb see sei seo sep ses set sib sie sii sio sip sis sit sob soe soi soo sop sos sot spb spe spi spo spp sps spt ss- ssb sse ssi sso ssp sss sst stb ste sti sto stp sts stt tbb tbe tbi tbo tbp tbs tbt te- teb tee tei teo tep tes tet tib tie tii tio tip tis tit to- tob toe toi too top tos tot tpb tpe tpi tpo tpp tps tpt tsb tse tsi tso tsp tss tst ttb tte tti tto ttp tts ttt