-er b-u bbb bbe bbg bbh bbk bbo bbr bbu be- beb bee beg beh bek beo ber beu bgb bge bgg bgh bgk bgo bgr bgu bhb bhe bhg bhh bhk bho bhr bhu bkb bke bkg bkk bko bkr bob boe bog boh bok boo bor bou brb bre brg brh brk bro brr bru bub bue bug buh buk buo bur buu ebb ebe ebg ebh ebk ebo ebr ebu eeb eee eeg eek eeo eer egb ege egg egh ego egr egu ehb ehe ehg ehh eho ehr ehu ekb eke ekg ekh eko ekr eku eo- eob eoe eog eoh eok eoo eor eou erb ere erg erh erk ero err eru eu- eub eue eug eur gbe gbg gbh gbk gbo gbr gbu ge- geb gee geg geh gek geo ger geu ggb ggg ggh ggo ggr ggu ghb ghe ghg ghh gho ghr gkb gkh gko gob goe gog goh gok goo gor gou grb gre grg grh grk gro grr gru gu- gub gue gug guk guo gur guu hbb hbe hbg hbh hbk hbo hbr hbu he- heb hee heg heh hek heo her heu hgb hge hgg hgh hgk hgo hgr hgu hhb hhe hhg hhh hhk hho hhr hhu hkb hkg hkh hkk hko hkr hku hob hoe hog hoh hok hoo hor hou hr- hrb hre hrg hrh hrk hro hrr hru hub hue hug huh huk huo hur huu kbb kbe kbh kbk kbo kbr kbu ke- keb kee keg keh kek keo ker kgb kgh kgo kgu khe khh khk kho khr khu kkb kke kkh kkk kkr kku kob koe kog koh kok koo kor kou krg krk kro krr kru kub kue kug kuh kuk kur kuu ob- obb obe obg obh obk obo obr obu oeb oee oeg oeh oeo oer oge ogg ogh ogo ohe ohg ohh oho ohr ohu okb oke okg okk oko okr oku oo- oob oog ooh ook ooo oor or- orb ore org orh ork oro orr oru ou- oue ouh ouk ouo our rbb rbe rbg rbh rbk rbo rbr rbu re- reb ree reg reh rek reo rer reu rgb rge rgg rgh rgk rgo rgr rh- rhb rhe rhg rhh rho rhr rhu rkb rke rkg rkk rko rku rob roe rog roh rok roo ror rou rrb rrg rrh rrk rrr rru rub rue rug ruh ruk ruo rur ruu ubb ube ubg ubh ubk ubo ubr ubu ueb uee ueg ueh uer ugb uge ugg ugh ugk ugo ugr ugu uhb uhe uhh uho uhr uhu ukb uke ukk ukr uku uob uoe uog uok uoo uor ur- urb ure urg urk uro urr uru uue uug uur uuu