-er bbb bbe bbh bbk bbn bbo bbr be- beb bee beh bek ben beo ber bhb bhe bhh bhk bho bhr bkb bke bkk bkn bko bkr bnb bne bnk bnn bno bnr bob boe boh bok bon boo bor brb bre brh brk brn bro brr ebb ebe ebh ebk ebn ebo ebr eeb eee eek een eeo eer ehb ehe ehh ehn eho ehr ekb eke ekh eko ekr en- enb ene enh enk enn eno enr eo- eob eoe eoh eok eon eoo eor erb ere erh erk ern ero err hbb hbe hbh hbk hbn hbo hbr he- heb hee heh hek hen heo her hhb hhe hhh hhk hhn hho hhr hkb hkh hkk hkn hko hkr hnb hne hnh hnk hnn hno hob hoe hoh hok hon hoo hor hr- hrb hre hrh hrk hrn hro hrr kbb kbe kbh kbk kbn kbo kbr ke- keb kee keh kek ken keo ker khe khh khk khn kho khr kkb kke kkh kkk kkn kkr kn- kne knk knn kno knr kob koe koh kok kon koo kor krk krn kro krr nbb nbe nbk nbn nbo nbr ne- neb nee neh nek nen neo ner nhb nhe nhh nhk nhn nhr nke nkk nkn nko nkr nnb nne nnh nnk nnn nno no- nob noe noh nok non noo nor nrb nre nrk nrn nro nrr ob- obb obe obh obk obn obo obr oeb oee oeh oen oeo oer ohe ohh ohn oho ohr okb oke okk oko okr on- onb one onh onk onn ono onr oo- oob ooh ook oon ooo oor or- orb ore orh ork orn oro orr rbb rbe rbh rbk rbn rbo rbr re- reb ree reh rek ren reo rer rh- rhb rhe rhh rhn rho rhr rkb rke rkk rko rnb rnh rnn rno rnr rob roe roh rok ron roo ror rrb rrh rrk rrn rrr