-er bbb bbc bbe bbh bbr bbs bcb bcc bce bch bcr bcs be- beb bec bee beh ber bes bhb bhc bhe bhh bhr bhs brb bre brh brr brs bsb bsc bse bsh bsr bss c-- cbb cbc cbe cbh cbr cbs ccb ccc cce cch ccr ccs ce- ceb cec cee ceh cer ces ch- chb chc che chh chr chs crb crc cre crh crr crs csb csc cse csh csr css ebb ebc ebe ebh ebr ebs ec- ecb ecc ece ech ecr ecs eeb eec eee eer ees ehb ehc ehe ehh ehr ehs erb erc ere erh err ers es- esb esc ese esh esr ess hbb hbc hbe hbh hbr hbs hcb hcc hce hch hcr hcs he- heb hec hee heh her hes hhb hhc hhe hhh hhr hhs hr- hrb hrc hre hrh hrr hrs hsb hsc hse hsh hsr hss rbb rbc rbe rbh rbr rbs rcb rcc rce rch rcr rcs re- reb rec ree reh rer res rh- rhb rhc rhe rhh rhr rhs rrb rrc rrh rrr rrs rsb rsc rse rsh rsr rss sbb sbc sbe sbh sbr sbs scb scc sce sch scr scs se- seb sec see seh ser ses sh- shb shc she shh shr shs sr- srb src sre srh srr srs ss- ssb ssc sse ssh ssr sss