b-p bbb bbe bbo bbp bbt be- beb bee beo bep bet bob boe boo bop bot bpb bpe bpo bpp bpt btb bte bto btp btt ebb ebe ebo ebp ebt eeb eee eeo eep eet eo- eob eoe eoo eop eot ep- epb epe epo epp ept etb ete eto etp ett ob- obb obe obo obp obt oeb oee oeo oep oet oo- oob ooo oop oot op- opb ope opo opp opt ot- otb ote oto otp ott p-p pbb pbe pbo pbp pbt peb pee peo pep pet pob poe poo pop pot ppb ppe ppo ppp ppt pt- ptb pte pto ptp ptt tbb tbe tbo tbp tbt te- teb tee teo tep tet to- tob toe too top tot tpb tpe tpo tpp tpt ttb tte tto ttp ttt