-er -up b-p b-u bbb bbe bbf bbg bbk bbp bbr bbu be- beb bee bef beg bek bep ber beu bfb bfe bff bfg bfp bfr bfu bgb bge bgf bgg bgk bgp bgr bgu bkb bke bkf bkg bkk bkp bkr bpb bpe bpf bpg bpp bpr bpu brb bre brf brg brk brp brr bru bub bue buf bug buk bup bur buu ebb ebe ebf ebg ebk ebp ebr ebu eeb eee eef eeg eek eep eer ef- efb efe eff efg efp efr egb ege egf egg egp egr egu ekb eke ekf ekg ekp ekr eku ep- epb epe epf epg epp epr epu erb ere erf erg erk erp err eru eu- eub eue euf eug eup eur fbb fbe fbf fbg fbk fbp fbr fbu feb fee fef feg fek fep fer feu ffe fff ffg ffk ffp ffr ffu fgb fge fgf fgg fgp fgr fkb fkf fkg fkk fkp fpb fpe fpg fpk fpp fpr fpu frb fre frf frg frk frp frr fru fub fue fuf fug fuk fup fur fuu g-p gbe gbf gbg gbk gbp gbr gbu ge- geb gee gef geg gek gep ger geu gfb gfe gff gfk gfp gfr ggb ggg ggp ggr ggu gkb gkp gpb gpe gpf gpg gpk gpp gpr gpu grb gre grf grg grk grp grr gru gu- gub gue guf gug guk gup gur guu kbb kbe kbf kbk kbp kbr kbu ke- keb kee kef keg kek kep ker kff kfg kfu kgb kgf kgp kgu kkb kke kkk kkp kkr kku kpe kpf kpk kpp kpr kpu krf krg krk krp krr kru kub kue kug kuk kup kur kuu p-p pbb pbe pbf pbg pbk pbp pbr pbu peb pee pef peg pek pep per peu pfb pfe pff pfg pfk pfp pfr pfu pgb pge pgf pgg pgk pgp pgr pkb pke pkf pkg pkp pkr pku ppb ppe ppf ppg ppk ppp ppr ppu prb pre prf prg prk prp prr pru pub pue puf pug puk pup pur puu rbb rbe rbf rbg rbk rbp rbr rbu re- reb ree ref reg rek rep rer reu rfb rfe rff rfg rfk rfp rfr rfu rgb rge rgf rgg rgk rgp rgr rkb rke rkf rkg rkk rkp rku rpb rpe rpf rpg rpk rpp rpr rpu rrb rrf rrg rrk rrp rrr rru rub rue ruf rug ruk rup rur ruu ubb ube ubf ubg ubk ubp ubr ubu ueb uee uef ueg uep uer ufe uff ufg ufp ufr ufu ugb uge ugf ugg ugk ugp ugr ugu ukb uke ukf ukk ukp ukr uku up- upb upe upf upg upk upp upr upu ur- urb ure urf urg urk urp urr uru uue uug uur uuu