b-p bbb bbc bbe bbk bbo bbp bbt bcb bcc bce bck bco bcp bct be- beb bec bee bek beo bep bet bkb bkc bke bkk bko bkp bkt bob boc boe bok boo bop bot bpb bpc bpe bpo bpp bpt btb btc bte btk bto btp btt c-- cbb cbc cbe cbk cbo cbp cbt ccb ccc cce cck cco ccp cct ce- ceb cec cee cek ceo cep cet ckb ckc cko ckt co- cob coc coe cok coo cop cot cpb cpc cpe cpk cpo cpp cpt ctb ctc cte ctk cto ctp ctt ebb ebc ebe ebk ebo ebp ebt ec- ecb ecc ece eck eco ect eeb eec eee eek eeo eep eet ekb ekc eke eko ekp ekt eo- eob eoc eoe eok eoo eop eot ep- epb epc epe epo epp ept etb etc ete etk eto etp ett k-t kbb kbc kbe kbk kbo kbp kcb kcc kce kck kcp kct ke- keb kec kee kek keo kep ket kkb kkc kke kkk kkp kkt kob koc koe kok koo kop kot kpc kpe kpk kpo kpp kpt ktb ktc kte ktk kto ktp ktt ob- obb obc obe obk obo obp obt oc- ocb occ ock oco ocp oct oeb oec oee oeo oep oet okb okc oke okk oko okp oo- oob ooc ook ooo oop oot op- opb opc ope opk opo opp opt ot- otb otc ote otk oto otp ott p-p pbb pbc pbe pbk pbo pbp pbt pcb pcc pce pck pco pcp pct peb pec pee pek peo pep pet pkb pkc pke pko pkp pkt pob poc poe pok poo pop pot ppb ppc ppe ppk ppo ppp ppt pt- ptb ptc pte ptk pto ptp ptt tbb tbc tbe tbk tbo tbp tbt tcb tcc tce tck tco tcp tct te- teb tec tee tek teo tep tet tkb tkc tke tkk tko tkp tkt to- tob toc toe tok too top tot tpb tpc tpe tpk tpo tpp tpt ttb ttc tte ttk tto ttp ttt