-er bbb bbc bbe bbh bbr bbs bbx bcb bcc bce bch bcr bcs bcx be- beb bec bee beh ber bes bex bhb bhc bhe bhh bhr bhs bhx brb bre brh brr brs brx bsb bsc bse bsh bsr bss bsx bxb bxx c-- cbb cbc cbe cbh cbr cbs cbx ccb ccc cce cch ccr ccs ccx ce- ceb cec cee ceh cer ces cex ch- chb chc che chh chr chs chx crb crc cre crh crr crs crx csb csc cse csh csr css csx cxc cxh cxr cxs cxx ebb ebc ebe ebh ebr ebs ebx ec- ecb ecc ece ech ecr ecs ecx eeb eec eee eer ees eex ehb ehc ehe ehh ehr ehs erb erc ere erh err ers es- esb esc ese esh esr ess esx ex- exc exe exh exr exs exx hbb hbc hbe hbh hbr hbs hbx hcb hcc hce hch hcr hcs he- heb hec hee heh her hes hex hhb hhc hhe hhh hhr hhs hr- hrb hrc hre hrh hrr hrs hsb hsc hse hsh hsr hss hsx hxc rbb rbc rbe rbh rbr rbs rbx rcb rcc rce rch rcr rcs rcx re- reb rec ree reh rer res rex rh- rhb rhc rhe rhh rhr rhs rrb rrc rrh rrr rrs rsb rsc rse rsh rsr rss rsx rxr rxs sbb sbc sbe sbh sbr sbs sbx scb scc sce sch scr scs scx se- seb sec see seh ser ses sex sh- shb shc she shh shr shs sr- srb src sre srh srr srs srx ss- ssb ssc sse ssh ssr sss ssx sxc sxs xbc xbe xbr xbx xcb xch xcr xcx xee xer xes xex xrc xrx xsb xsc xss xxx