-er bbb bbe bbg bbk bbn bbo bbr be- beb bee beg bek ben beo ber bez bgb bge bgg bgk bgn bgo bgr bgz bkb bke bkg bkk bkn bko bkr bnb bne bng bnk bnn bno bnr bnz bob boe bog bok bon boo bor boz brb bre brg brk brn bro brr brz bze bzn bzo bzr bzz ebb ebe ebg ebk ebn ebo ebr eeb eee eeg eek een eeo eer egb ege egg egn ego egr ekb eke ekg eko ekr en- enb ene eng enk enn eno enr enz eo- eob eoe eog eok eon eoo eor erb ere erg erk ern ero err erz eze ezo ezr ezz gbe gbg gbk gbn gbo gbr gbz ge- geb gee geg gek gen geo ger gez ggb ggg ggn ggo ggr ggz gkb gkn gko gnb gne gnn gno gnr gob goe gog gok gon goo gor goz grb gre grg grk grn gro grr gzo gzr k-z kbb kbe kbk kbn kbo kbr kbz ke- keb kee keg kek ken keo ker kez kgb kgo kkb kke kkk kkn kkr kn- kne kng knk knn kno knr kob koe kog kok kon koo kor koz krg krk krn kro krr kzo nbb nbe nbg nbk nbn nbo nbr ne- neb nee neg nek nen neo ner nez ngb nge ngg ngk ngn ngo nke nkk nkn nko nkr nnb nne nng nnk nnn nno nnz no- nob noe nog nok non noo nor noz nrb nre nrg nrk nrn nro nrr nrz nzb nze nzg nzo nzz ob- obb obe obg obk obn obo obr oeb oee oeg oen oeo oer oge ogg ogn ogo okb oke okg okk oko okr on- onb one ong onk onn ono onr oo- oob oog ook oon ooo oor or- orb ore org ork orn oro orr orz oze ozo ozz rbb rbe rbg rbk rbn rbo rbr re- reb ree reg rek ren reo rer rez rgb rge rgg rgk rgn rgo rgr rkb rke rkg rkk rko rkz rnb rng rnn rno rnr rnz rob roe rog rok ron roo ror roz rrb rrg rrk rrn rrr rzb rze rzo z-g zbb zbr zeb zee zek zen zeo zer zez zgb zgg zne znn zno zo- zob zoe zog zok zon zoo zor zro zzr zzz