b-p bbb bbc bbe bbk bbo bbp bbs bcb bcc bce bck bco bcp bcs be- beb bec bee bek beo bep bes bkb bkc bke bkk bko bkp bks bob boc boe bok boo bop bos bpb bpc bpe bpo bpp bps bsb bsc bse bsk bso bsp bss c-- cbb cbc cbe cbk cbo cbp cbs ccb ccc cce cck cco ccp ccs ce- ceb cec cee cek ceo cep ces ckb ckc cko cks co- cob coc coe cok coo cop cos cpb cpc cpe cpk cpo cpp cps csb csc cse csk cso csp css ebb ebc ebe ebk ebo ebp ebs ec- ecb ecc ece eck eco ecs eeb eec eee eek eeo eep ees ekb ekc eke eko ekp eks eo- eob eoc eoe eok eoo eop eos ep- epb epc epe epo epp eps es- esb esc ese esk eso esp ess kbb kbc kbe kbk kbo kbp kbs kcb kcc kce kck kcp kcs ke- keb kec kee kek keo kep kes kkb kkc kke kkk kkp kks kob koc koe kok koo kop kos kpc kpe kpk kpo kpp kps ksb ksc kse ksk kso ksp kss ob- obb obc obe obk obo obp obs oc- ocb occ ock oco ocp ocs oeb oec oee oeo oep oes okb okc oke okk oko okp oks oo- oob ooc ook ooo oop oos op- opb opc ope opk opo opp ops os- osb osc ose osk oso osp oss p-p pbb pbc pbe pbk pbo pbp pbs pcb pcc pce pck pco pcp pcs peb pec pee pek peo pep pes pkb pkc pke pko pkp pks pob poc poe pok poo pop pos ppb ppc ppe ppk ppo ppp pps ps- psb psc pse psk pso psp pss sbb sbc sbe sbk sbo sbp sbs scb scc sce sck sco scp scs se- seb sec see sek seo sep ses sk- skb skc ske skk sko skp sks sob soc soe sok soo sop sos spb spc spe spk spo spp sps ss- ssb ssc sse ssk sso ssp sss