-er bbb bbc bbe bbg bbh bbn bbo bbr bcb bcc bce bcg bch bcn bco bcr be- beb bec bee beg beh ben beo ber bgb bgc bge bgg bgh bgn bgo bgr bhb bhc bhe bhg bhh bho bhr bnb bnc bne bng bnn bno bnr bob boc boe bog boh bon boo bor brb bre brg brh brn bro brr c-- cbb cbc cbe cbg cbh cbn cbo cbr ccb ccc cce ccg cch ccn cco ccr ce- ceb cec cee ceg ceh cen ceo cer cgb cgc cge cgg cgh cgn cgo cgr ch- chb chc che chg chh chn cho chr cn- cnb cnc cne cng cnh cnn cno cnr co- cob coc coe cog coh con coo cor crb crc cre crg crh crn cro crr ebb ebc ebe ebg ebh ebn ebo ebr ec- ecb ecc ece ecg ech ecn eco ecr eeb eec eee eeg een eeo eer egb egc ege egg egh egn ego egr ehb ehc ehe ehg ehh ehn eho ehr en- enb enc ene eng enh enn eno enr eo- eob eoc eoe eog eoh eon eoo eor erb erc ere erg erh ern ero err gbc gbe gbg gbh gbn gbo gbr gcb gcc gce gcg gch gcn gco gcr ge- geb gec gee geg geh gen geo ger ggb ggc ggg ggh ggn ggo ggr ghb ghc ghe ghg ghh ghn gho ghr gnb gnc gne gnn gno gnr gob goc goe gog goh gon goo gor grb grc gre grg grh grn gro grr hbb hbc hbe hbg hbh hbn hbo hbr hcb hcc hce hcg hch hcn hco hcr he- heb hec hee heg heh hen heo her hgb hgc hge hgg hgh hgn hgo hgr hhb hhc hhe hhg hhh hhn hho hhr hnb hnc hne hng hnh hnn hno hob hoc hoe hog hoh hon hoo hor hr- hrb hrc hre hrg hrh hrn hro hrr nbb nbc nbe nbg nbn nbo nbr ncb ncc nce ncg nch ncn nco ncr ne- neb nec nee neg neh nen neo ner ngb ngc nge ngg ngh ngn ngo nhb nhc nhe nhg nhh nhn nhr nnb nnc nne nng nnh nnn nno no- nob noc noe nog noh non noo nor nrb nrc nre nrg nrn nro nrr ob- obb obc obe obg obh obn obo obr oc- ocb occ ocg och ocn oco ocr oeb oec oee oeg oeh oen oeo oer ogc oge ogg ogh ogn ogo ohc ohe ohg ohh ohn oho ohr on- onb onc one ong onh onn ono onr oo- oob ooc oog ooh oon ooo oor or- orb orc ore org orh orn oro orr rbb rbc rbe rbg rbh rbn rbo rbr rcb rcc rce rcg rch rcn rco rcr re- reb rec ree reg reh ren reo rer rgb rgc rge rgg rgh rgn rgo rgr rh- rhb rhc rhe rhg rhh rhn rho rhr rnb rnc rng rnh rnn rno rnr rob roc roe rog roh ron roo ror rrb rrc rrg rrh rrn rrr