-er bbb bbc bbe bbh bbn bbo bbr bcb bcc bce bch bcn bco bcr be- beb bec bee beh ben beo ber bhb bhc bhe bhh bho bhr bnb bnc bne bnn bno bnr bob boc boe boh bon boo bor brb bre brh brn bro brr c-- cbb cbc cbe cbh cbn cbo cbr ccb ccc cce cch ccn cco ccr ce- ceb cec cee ceh cen ceo cer ch- chb chc che chh chn cho chr cn- cnb cnc cne cnh cnn cno cnr co- cob coc coe coh con coo cor crb crc cre crh crn cro crr ebb ebc ebe ebh ebn ebo ebr ec- ecb ecc ece ech ecn eco ecr eeb eec eee een eeo eer ehb ehc ehe ehh ehn eho ehr en- enb enc ene enh enn eno enr eo- eob eoc eoe eoh eon eoo eor erb erc ere erh ern ero err hbb hbc hbe hbh hbn hbo hbr hcb hcc hce hch hcn hco hcr he- heb hec hee heh hen heo her hhb hhc hhe hhh hhn hho hhr hnb hnc hne hnh hnn hno hob hoc hoe hoh hon hoo hor hr- hrb hrc hre hrh hrn hro hrr nbb nbc nbe nbn nbo nbr ncb ncc nce nch ncn nco ncr ne- neb nec nee neh nen neo ner nhb nhc nhe nhh nhn nhr nnb nnc nne nnh nnn nno no- nob noc noe noh non noo nor nrb nrc nre nrn nro nrr ob- obb obc obe obh obn obo obr oc- ocb occ och ocn oco ocr oeb oec oee oeh oen oeo oer ohc ohe ohh ohn oho ohr on- onb onc one onh onn ono onr oo- oob ooc ooh oon ooo oor or- orb orc ore orh orn oro orr rbb rbc rbe rbh rbn rbo rbr rcb rcc rce rch rcn rco rcr re- reb rec ree reh ren reo rer rh- rhb rhc rhe rhh rhn rho rhr rnb rnc rnh rnn rno rnr rob roc roe roh ron roo ror rrb rrc rrh rrn rrr