-er bbb bbc bbe bbg bbh bbk bbn bbo bbr bcb bcc bce bcg bch bck bcn bco bcr be- beb bec bee beg beh bek ben beo ber bgb bgc bge bgg bgh bgk bgn bgo bgr bhb bhc bhe bhg bhh bhk bho bhr bkb bkc bke bkg bkk bkn bko bkr bnb bnc bne bng bnk bnn bno bnr bob boc boe bog boh bok bon boo bor brb bre brg brh brk brn bro brr c-- cbb cbc cbe cbg cbh cbk cbn cbo cbr ccb ccc cce ccg cch cck ccn cco ccr ce- ceb cec cee ceg ceh cek cen ceo cer cgb cgc cge cgg cgh cgn cgo cgr ch- chb chc che chg chh chk chn cho chr ckb ckc ckh cko cn- cnb cnc cne cng cnh cnn cno cnr co- cob coc coe cog coh cok con coo cor crb crc cre crg crh crk crn cro crr ebb ebc ebe ebg ebh ebk ebn ebo ebr ec- ecb ecc ece ecg ech eck ecn eco ecr eeb eec eee eeg eek een eeo eer egb egc ege egg egh egn ego egr ehb ehc ehe ehg ehh ehn eho ehr ekb ekc eke ekg ekh eko ekr en- enb enc ene eng enh enk enn eno enr eo- eob eoc eoe eog eoh eok eon eoo eor erb erc ere erg erh erk ern ero err gbc gbe gbg gbh gbk gbn gbo gbr gcb gcc gce gcg gch gck gcn gco gcr ge- geb gec gee geg geh gek gen geo ger ggb ggc ggg ggh ggn ggo ggr ghb ghc ghe ghg ghh ghn gho ghr gkb gkh gkn gko gnb gnc gne gnn gno gnr gob goc goe gog goh gok gon goo gor grb grc gre grg grh grk grn gro grr hbb hbc hbe hbg hbh hbk hbn hbo hbr hcb hcc hce hcg hch hck hcn hco hcr he- heb hec hee heg heh hek hen heo her hgb hgc hge hgg hgh hgk hgn hgo hgr hhb hhc hhe hhg hhh hhk hhn hho hhr hkb hkg hkh hkk hkn hko hkr hnb hnc hne hng hnh hnk hnn hno hob hoc hoe hog hoh hok hon hoo hor hr- hrb hrc hre hrg hrh hrk hrn hro hrr kbb kbc kbe kbh kbk kbn kbo kbr kcb kcc kce kcg kch kck kcn kcr ke- keb kec kee keg keh kek ken keo ker kgb kgc kgh kgo khe khh khk khn kho khr kkb kkc kke kkh kkk kkn kkr kn- knc kne kng knk knn kno knr kob koc koe kog koh kok kon koo kor krc krg krk krn kro krr nbb nbc nbe nbg nbk nbn nbo nbr ncb ncc nce ncg nch nck ncn nco ncr ne- neb nec nee neg neh nek nen neo ner ngb ngc nge ngg ngh ngk ngn ngo nhb nhc nhe nhg nhh nhk nhn nhr nkc nke nkk nkn nko nkr nnb nnc nne nng nnh nnk nnn nno no- nob noc noe nog noh nok non noo nor nrb nrc nre nrg nrk nrn nro nrr ob- obb obc obe obg obh obk obn obo obr oc- ocb occ ocg och ock ocn oco ocr oeb oec oee oeg oeh oen oeo oer ogc oge ogg ogh ogn ogo ohc ohe ohg ohh ohn oho ohr okb okc oke okg okk oko okr on- onb onc one ong onh onk onn ono onr oo- oob ooc oog ooh ook oon ooo oor or- orb orc ore org orh ork orn oro orr rbb rbc rbe rbg rbh rbk rbn rbo rbr rcb rcc rce rcg rch rcn rco rcr re- reb rec ree reg reh rek ren reo rer rgb rgc rge rgg rgh rgk rgn rgo rgr rh- rhb rhc rhe rhg rhh rhn rho rhr rkb rkc rke rkg rkk rko rnb rnc rng rnh rnn rno rnr rob roc roe rog roh rok ron roo ror rrb rrc rrg rrh rrk rrn rrr