-er bbb bbe bbg bbi bbk bbo bbr bbt be- beb bee beg bei bek beo ber bet bgb bge bgg bgi bgk bgo bgr bgt bi- bib bie big bii bik bio bir bit bkb bke bkg bkk bko bkr bkt bob boe bog boi bok boo bor bot brb bre brg bri brk bro brr brt btb bte btg bti btk bto btr btt ebb ebe ebg ebi ebk ebo ebr ebt eeb eee eeg eek eeo eer eet egb ege egg egi ego egr egt eib eie eig eii eik eio eir eit ekb eke ekg eki eko ekr ekt eo- eob eoe eog eoi eok eoo eor eot erb ere erg eri erk ero err ert etb ete etg eti etk eto etr ett gbe gbg gbi gbk gbo gbr gbt ge- geb gee geg gei gek geo ger get ggb ggg ggi ggo ggr ggt gib gie gig gii gik gio gir git gkb gko gkt gob goe gog goi gok goo gor got grb gre grg gri grk gro grr grt gtb gte gtg gti gtk gto gtr gtt ibb ibe ibg ibi ibk ibo ibr ibt ie- iee ieg iei iek ier iet igb ige igg igi igk igo igr igt iib iie iii iio iir iit ikb ike iki ikk iko ikr ikt io- iob ioe iog ioi ioo ior iot ir- irb ire irg iri irk iro irr irt itb ite itg iti itk ito itt k-t kbb kbe kbi kbk kbo kbr ke- keb kee keg kei kek keo ker ket kgb kgi kgo kib kie kig kii kik kio kir kit kkb kke kki kkk kkr kkt kob koe kog koi kok koo kor kot krg kri krk kro krr krt ktb kte ktg ktk kto ktr ktt o-i ob- obb obe obg obi obk obo obr obt oeb oee oeg oei oeo oer oet oge ogg ogi ogo ogt oib oie oii oik oio oir oit okb oke okg oki okk oko okr oo- oob oog ooi ook ooo oor oot or- orb ore org ori ork oro orr ort ot- otb ote otg oti otk oto otr ott rbb rbe rbg rbi rbk rbo rbr rbt re- reb ree reg rei rek reo rer ret rgb rge rgg rgi rgk rgo rgr rgt rib rie rig rii rik rio rir rit rkb rke rkg rkk rko rkt rob roe rog roi rok roo ror rot rrb rrg rri rrk rrr rrt rtb rte rtg rti rtk rto rtr rtt tbb tbe tbg tbi tbk tbo tbr tbt te- teb tee teg tei tek teo ter tet tgb tge tgg tgi tgk tgo tgr tgt tib tie tig tii tik tio tir tit tkb tke tkg tkk tko tkr tkt to- tob toe tog toi tok too tor tot trb tre trg tri trk tro trr trt ttb tte ttg tti ttk tto ttr ttt