-er bbb bbe bbi bbk bbo bbr bbw be- beb bee bei bek beo ber bew bez bi- bib bie bii bik bio bir biw biz bkb bke bkk bko bkr bkw bob boe boi bok boo bor bow boz brb bre bri brk bro brr brw brz bwb bwi bwk bwo bwr bze bzo bzr bzz ebb ebe ebi ebk ebo ebr ebw eeb eee eek eeo eer eew eib eie eii eik eio eir ekb eke eki eko ekr eo- eob eoe eoi eok eoo eor eow erb ere eri erk ero err erw erz ewb ewe ewi ewk ewo ewr eww eze ezo ezr ezz ibb ibe ibi ibk ibo ibr ibw ibz ie- iee iei iek ier iib iie iii iio iir iiw ikb ike iki ikk iko ikr io- iob ioe ioi ioo ior iow ir- irb ire iri irk iro irr iwb iwe iwi iwk iwo iwr iww iwz ize izi izo izz k-z kbb kbe kbi kbk kbo kbr kbw kbz ke- keb kee kei kek keo ker kew kez kib kie kii kik kio kir kiz kkb kke kki kkk kkr kob koe koi kok koo kor kow koz kri krk kro krr krw kw- kwi kwk kwo kww kzo kzw o-i ob- obb obe obi obk obo obr obw oeb oee oei oeo oer oib oie oii oik oio oir oiz okb oke oki okk oko okr okw oo- oob ooi ook ooo oor oow or- orb ore ori ork oro orr orz owb owe owi owk owo oww oze ozo ozw ozz rbb rbe rbi rbk rbo rbr rbw re- reb ree rei rek reo rer rew rez rib rie rii rik rio rir riz rkb rke rkk rko rkz rob roe roi rok roo ror row roz rrb rri rrk rrr rwb rwe rwi rwr rzb rze rzo wbb wbe wbi wbo wbr wbw wbz web wee wei wek weo wer wew wez wib wie wii wik wir wiz wkb wke wko wkr wkw wob woe woi wok woo wor wow woz wr- wre wri wrk wro wrr wrw wwe wwi wwo www zbb zbr zbw zeb zee zek zeo zer zez zib zie zik zio zir ziw ziz zo- zob zoe zoi zok zoo zor zow zro zzr zzz