-er -up b-p b-u bbb bbe bbg bbk bbp bbr bbu be- beb bee beg bek bep ber beu bgb bge bgg bgk bgp bgr bgu bkb bke bkg bkk bkp bkr bpb bpe bpg bpp bpr bpu brb bre brg brk brp brr bru bub bue bug buk bup bur buu ebb ebe ebg ebk ebp ebr ebu eeb eee eeg eek eep eer egb ege egg egp egr egu ekb eke ekg ekp ekr eku ep- epb epe epg epp epr epu erb ere erg erk erp err eru eu- eub eue eug eup eur g-p gbe gbg gbk gbp gbr gbu ge- geb gee geg gek gep ger geu ggb ggg ggp ggr ggu gkb gkp gpb gpe gpg gpk gpp gpr gpu grb gre grg grk grp grr gru gu- gub gue gug guk gup gur guu kbb kbe kbk kbp kbr kbu ke- keb kee keg kek kep ker kgb kgp kgu kkb kke kkk kkp kkr kku kpe kpk kpp kpr kpu krg krk krp krr kru kub kue kug kuk kup kur kuu p-p pbb pbe pbg pbk pbp pbr pbu peb pee peg pek pep per peu pgb pge pgg pgk pgp pgr pkb pke pkg pkp pkr pku ppb ppe ppg ppk ppp ppr ppu prb pre prg prk prp prr pru pub pue pug puk pup pur puu rbb rbe rbg rbk rbp rbr rbu re- reb ree reg rek rep rer reu rgb rge rgg rgk rgp rgr rkb rke rkg rkk rkp rku rpb rpe rpg rpk rpp rpr rpu rrb rrg rrk rrp rrr rru rub rue rug ruk rup rur ruu ubb ube ubg ubk ubp ubr ubu ueb uee ueg uep uer ugb uge ugg ugk ugp ugr ugu ukb uke ukk ukp ukr uku up- upb upe upg upk upp upr upu ur- urb ure urg urk urp urr uru uue uug uur uuu