-up b-p b-u bbb bbe bbo bbp bbu be- beb bee beo bep beu bez bob boe boo bop bou boz bpb bpe bpo bpp bpu bub bue buo bup buu buz bze bzo bzp bzu bzz ebb ebe ebo ebp ebu eeb eee eeo eep eo- eob eoe eoo eop eou ep- epb epe epo epp epu epz eu- eub eue eup eze ezo ezz ob- obb obe obo obp obu oeb oee oeo oep oo- oob ooo oop op- opb ope opo opp ou- oue ouo oup oze ozo ozu ozz p-p pbb pbe pbo pbp pbu pbz peb pee peo pep peu pez pob poe poo pop pou poz ppb ppe ppo ppp ppu ppz pub pue pup puu puz pzp ubb ube ubo ubp ubu ueb uee uep uob uoe uoo uop up- upb upe upo upp upu upz uue uuu uzb uzo uzu zbb zeb zee zeo zep zez zo- zob zoe zoo zou zpe zpo zpp zpu zub zuz zzz