b-p bbb bbe bbn bbo bbp bbt be- beb bee ben beo bep bet bnb bne bnn bno bnp bnt bob boe bon boo bop bot bpb bpe bpn bpo bpp bpt btb bte btn bto btp btt ebb ebe ebn ebo ebp ebt eeb eee een eeo eep eet en- enb ene enn eno enp ent eo- eob eoe eon eoo eop eot ep- epb epe epn epo epp ept etb ete etn eto etp ett nbb nbe nbn nbo nbp nbt ne- neb nee nen neo nep net nnb nne nnn nno nnp nnt no- nob noe non noo nop not npb npe npn npo npp npt ntb nte ntn nto ntp ntt ob- obb obe obn obo obp obt oeb oee oen oeo oep oet on- onb one onn ono onp ont oo- oob oon ooo oop oot op- opb ope opn opo opp opt ot- otb ote otn oto otp ott p-p pbb pbe pbn pbo pbp pbt peb pee pen peo pep pet pn- pnb pne pnn pno pnp pnt pob poe pon poo pop pot ppb ppe ppn ppo ppp ppt pt- ptb pte ptn pto ptp ptt tbb tbe tbn tbo tbp tbt te- teb tee ten teo tep tet tnb tne tnn tno tnp tnt to- tob toe ton too top tot tpb tpe tpn tpo tpp tpt ttb tte ttn tto ttp ttt