b-p bbb bbc bbe bbk bbo bbp bbs bbt bcb bcc bce bck bco bcp bcs bct be- beb bec bee bek beo bep bes bet bkb bkc bke bkk bko bkp bks bkt bob boc boe bok boo bop bos bot bpb bpc bpe bpo bpp bps bpt bsb bsc bse bsk bso bsp bss bst btb btc bte btk bto btp bts btt c-- cbb cbc cbe cbk cbo cbp cbs cbt ccb ccc cce cck cco ccp ccs cct ce- ceb cec cee cek ceo cep ces cet ckb ckc cko cks ckt co- cob coc coe cok coo cop cos cot cpb cpc cpe cpk cpo cpp cps cpt csb csc cse csk cso csp css cst ctb ctc cte ctk cto ctp cts ctt ebb ebc ebe ebk ebo ebp ebs ebt ec- ecb ecc ece eck eco ecs ect eeb eec eee eek eeo eep ees eet ekb ekc eke eko ekp eks ekt eo- eob eoc eoe eok eoo eop eos eot ep- epb epc epe epo epp eps ept es- esb esc ese esk eso esp ess est etb etc ete etk eto etp ets ett k-t kbb kbc kbe kbk kbo kbp kbs kcb kcc kce kck kcp kcs kct ke- keb kec kee kek keo kep kes ket kkb kkc kke kkk kkp kks kkt kob koc koe kok koo kop kos kot kpc kpe kpk kpo kpp kps kpt ksb ksc kse ksk kso ksp kss kst ktb ktc kte ktk kto ktp kts ktt ob- obb obc obe obk obo obp obs obt oc- ocb occ ock oco ocp ocs oct oeb oec oee oeo oep oes oet okb okc oke okk oko okp oks oo- oob ooc ook ooo oop oos oot op- opb opc ope opk opo opp ops opt os- osb osc ose osk oso osp oss ost ot- otb otc ote otk oto otp ots ott p-p pbb pbc pbe pbk pbo pbp pbs pbt pcb pcc pce pck pco pcp pcs pct peb pec pee pek peo pep pes pet pkb pkc pke pko pkp pks pkt pob poc poe pok poo pop pos pot ppb ppc ppe ppk ppo ppp pps ppt ps- psb psc pse psk pso psp pss pst pt- ptb ptc pte ptk pto ptp pts ptt sbb sbc sbe sbk sbo sbp sbs sbt scb scc sce sck sco scp scs sct se- seb sec see sek seo sep ses set sk- skb skc ske skk sko skp sks skt sob soc soe sok soo sop sos sot spb spc spe spk spo spp sps spt ss- ssb ssc sse ssk sso ssp sss sst stb stc ste stk sto stp sts stt tbb tbc tbe tbk tbo tbp tbs tbt tcb tcc tce tck tco tcp tcs tct te- teb tec tee tek teo tep tes tet tkb tkc tke tkk tko tkp tks tkt to- tob toc toe tok too top tos tot tpb tpc tpe tpk tpo tpp tps tpt tsb tsc tse tsk tso tsp tss tst ttb ttc tte ttk tto ttp tts ttt