-er bbb bbc bbe bbg bbh bbr bbs bcb bcc bce bcg bch bcr bcs be- beb bec bee beg beh ber bes bgb bgc bge bgg bgh bgr bgs bhb bhc bhe bhg bhh bhr bhs brb bre brg brh brr brs bsb bsc bse bsg bsh bsr bss c-- cbb cbc cbe cbg cbh cbr cbs ccb ccc cce ccg cch ccr ccs ce- ceb cec cee ceg ceh cer ces cgb cgc cge cgg cgh cgr cgs ch- chb chc che chg chh chr chs crb crc cre crg crh crr crs csb csc cse csg csh csr css ebb ebc ebe ebg ebh ebr ebs ec- ecb ecc ece ecg ech ecr ecs eeb eec eee eeg eer ees egb egc ege egg egh egr egs ehb ehc ehe ehg ehh ehr ehs erb erc ere erg erh err ers es- esb esc ese esg esh esr ess gbc gbe gbg gbh gbr gbs gcb gcc gce gcg gch gcr gcs ge- geb gec gee geg geh ger ges ggb ggc ggg ggh ggr ggs ghb ghc ghe ghg ghh ghr ghs grb grc gre grg grh grr grs gsb gsc gse gsg gsr gss hbb hbc hbe hbg hbh hbr hbs hcb hcc hce hcg hch hcr hcs he- heb hec hee heg heh her hes hgb hgc hge hgg hgh hgr hgs hhb hhc hhe hhg hhh hhr hhs hr- hrb hrc hre hrg hrh hrr hrs hsb hsc hse hsg hsh hsr hss rbb rbc rbe rbg rbh rbr rbs rcb rcc rce rcg rch rcr rcs re- reb rec ree reg reh rer res rgb rgc rge rgg rgh rgr rgs rh- rhb rhc rhe rhg rhh rhr rhs rrb rrc rrg rrh rrr rrs rsb rsc rse rsg rsh rsr rss sbb sbc sbe sbg sbh sbr sbs scb scc sce scg sch scr scs se- seb sec see seg seh ser ses sgb sgc sge sgg sgh sgr sgs sh- shb shc she shg shh shr shs sr- srb src sre srg srh srr srs ss- ssb ssc sse ssg ssh ssr sss