-er bbb bbe bbh bbk bbo bbr be- beb bee beh bek beo ber bez bhb bhe bhh bhk bho bhr bkb bke bkk bko bkr bob boe boh bok boo bor boz brb bre brh brk bro brr brz bze bzh bzo bzr bzz ebb ebe ebh ebk ebo ebr eeb eee eek eeo eer ehb ehe ehh eho ehr ekb eke ekh eko ekr eo- eob eoe eoh eok eoo eor erb ere erh erk ero err erz eze ezh ezo ezr ezz hbb hbe hbh hbk hbo hbr hbz he- heb hee heh hek heo her hez hhb hhe hhh hhk hho hhr hhz hkb hkh hkk hko hkr hob hoe hoh hok hoo hor hr- hrb hre hrh hrk hro hrr hrz hze hzo k-z kbb kbe kbh kbk kbo kbr kbz ke- keb kee keh kek keo ker kez khe khh khk kho khr khz kkb kke kkh kkk kkr kob koe koh kok koo kor koz krk kro krr kzo ob- obb obe obh obk obo obr oeb oee oeh oeo oer ohe ohh oho ohr okb oke okk oko okr oo- oob ooh ook ooo oor or- orb ore orh ork oro orr orz oze ozo ozz rbb rbe rbh rbk rbo rbr re- reb ree reh rek reo rer rez rh- rhb rhe rhh rho rhr rkb rke rkk rko rkz rob roe roh rok roo ror roz rrb rrh rrk rrr rzb rze rzo zbb zbr zeb zee zeh zek zeo zer zez zhe zho zhr zo- zob zoe zok zoo zor zrh zro zzr zzz