-er bbb bbc bbe bbh bbn bbo bbr bbs bcb bcc bce bch bcn bco bcr bcs be- beb bec bee beh ben beo ber bes bhb bhc bhe bhh bho bhr bhs bnb bnc bne bnn bno bnr bns bob boc boe boh bon boo bor bos brb bre brh brn bro brr brs bsb bsc bse bsh bsn bso bsr bss c-- cbb cbc cbe cbh cbn cbo cbr cbs ccb ccc cce cch ccn cco ccr ccs ce- ceb cec cee ceh cen ceo cer ces ch- chb chc che chh chn cho chr chs cn- cnb cnc cne cnh cnn cno cnr cns co- cob coc coe coh con coo cor cos crb crc cre crh crn cro crr crs csb csc cse csh csn cso csr css ebb ebc ebe ebh ebn ebo ebr ebs ec- ecb ecc ece ech ecn eco ecr ecs eeb eec eee een eeo eer ees ehb ehc ehe ehh ehn eho ehr ehs en- enb enc ene enh enn eno enr ens eo- eob eoc eoe eoh eon eoo eor eos erb erc ere erh ern ero err ers es- esb esc ese esh esn eso esr ess hbb hbc hbe hbh hbn hbo hbr hbs hcb hcc hce hch hcn hco hcr hcs he- heb hec hee heh hen heo her hes hhb hhc hhe hhh hhn hho hhr hhs hnb hnc hne hnh hnn hno hns hob hoc hoe hoh hon hoo hor hos hr- hrb hrc hre hrh hrn hro hrr hrs hsb hsc hse hsh hsn hsr hss nbb nbc nbe nbn nbo nbr nbs ncb ncc nce nch ncn nco ncr ncs ne- neb nec nee neh nen neo ner nes nhb nhc nhe nhh nhn nhr nhs nnb nnc nne nnh nnn nno nns no- nob noc noe noh non noo nor nos nrb nrc nre nrn nro nrr nrs nsb nsc nse nsh nsn nso nsr nss ob- obb obc obe obh obn obo obr obs oc- ocb occ och ocn oco ocr ocs oeb oec oee oeh oen oeo oer oes ohc ohe ohh ohn oho ohr ohs on- onb onc one onh onn ono onr ons oo- oob ooc ooh oon ooo oor oos or- orb orc ore orh orn oro orr ors os- osb osc ose osh osn oso osr oss rbb rbc rbe rbh rbn rbo rbr rbs rcb rcc rce rch rcn rco rcr rcs re- reb rec ree reh ren reo rer res rh- rhb rhc rhe rhh rhn rho rhr rhs rnb rnc rnh rnn rno rnr rns rob roc roe roh ron roo ror ros rrb rrc rrh rrn rrr rrs rsb rsc rse rsh rsn rso rsr rss sbb sbc sbe sbh sbn sbo sbr sbs scb scc sce sch scn sco scr scs se- seb sec see seh sen seo ser ses sh- shb shc she shh shn sho shr shs snb snc sne snn sno snr sns sob soc soe soh son soo sor sos sr- srb src sre srh srn sro srr srs ss- ssb ssc sse ssh ssn sso ssr sss