b-p bbb bbe bbk bbo bbp bbt be- beb bee bek beo bep bet bkb bke bkk bko bkp bkt bob boe bok boo bop bot bpb bpe bpo bpp bpt btb bte btk bto btp btt ebb ebe ebk ebo ebp ebt eeb eee eek eeo eep eet ekb eke eko ekp ekt eo- eob eoe eok eoo eop eot ep- epb epe epo epp ept etb ete etk eto etp ett k-t kbb kbe kbk kbo kbp ke- keb kee kek keo kep ket kkb kke kkk kkp kkt kob koe kok koo kop kot kpe kpk kpo kpp kpt ktb kte ktk kto ktp ktt ob- obb obe obk obo obp obt oeb oee oeo oep oet okb oke okk oko okp oo- oob ook ooo oop oot op- opb ope opk opo opp opt ot- otb ote otk oto otp ott p-p pbb pbe pbk pbo pbp pbt peb pee pek peo pep pet pkb pke pko pkp pkt pob poe pok poo pop pot ppb ppe ppk ppo ppp ppt pt- ptb pte ptk pto ptp ptt tbb tbe tbk tbo tbp tbt te- teb tee tek teo tep tet tkb tke tkk tko tkp tkt to- tob toe tok too top tot tpb tpe tpk tpo tpp tpt ttb tte ttk tto ttp ttt