-up b-p b-u bbb bbe bbo bbp bbu be- beb bee beo bep beu bob boe boo bop bou bpb bpe bpo bpp bpu bub bue buo bup buu ebb ebe ebo ebp ebu eeb eee eeo eep eo- eob eoe eoo eop eou ep- epb epe epo epp epu eu- eub eue eup ob- obb obe obo obp obu oeb oee oeo oep oo- oob ooo oop op- opb ope opo opp ou- oue ouo oup p-p pbb pbe pbo pbp pbu peb pee peo pep peu pob poe poo pop pou ppb ppe ppo ppp ppu pub pue pup puu ubb ube ubo ubp ubu ueb uee uep uob uoe uoo uop up- upb upe upo upp upu uue uuu