-er -ic bbb bbc bbe bbh bbi bbk bbr bbs bcb bcc bce bch bci bck bcr bcs be- beb bec bee beh bei bek ber bes bhb bhc bhe bhh bhi bhk bhr bhs bi- bib bic bie bih bii bik bir bis bkb bkc bke bkk bkr bks brb bre brh bri brk brr brs bsb bsc bse bsh bsi bsk bsr bss c-- cbb cbc cbe cbh cbi cbk cbr cbs ccb ccc cce cch cci cck ccr ccs ce- ceb cec cee ceh cei cek cer ces ch- chb chc che chh chi chk chr chs ci- cib cic cie cih cii cik cir cis ckb ckc ckh cki cks crb crc cre crh cri crk crr crs csb csc cse csh csi csk csr css ebb ebc ebe ebh ebi ebk ebr ebs ec- ecb ecc ece ech eci eck ecr ecs eeb eec eee eek eer ees ehb ehc ehe ehh ehi ehr ehs eib eic eie eii eik eir eis ekb ekc eke ekh eki ekr eks erb erc ere erh eri erk err ers es- esb esc ese esh esi esk esr ess h-i hbb hbc hbe hbh hbi hbk hbr hbs hcb hcc hce hch hci hck hcr hcs he- heb hec hee heh hei hek her hes hhb hhc hhe hhh hhi hhk hhr hhs hib hic hie hih hii hik hir his hkb hkh hki hkk hkr hks hr- hrb hrc hre hrh hri hrk hrr hrs hsb hsc hse hsh hsi hsk hsr hss ibb ibc ibe ibh ibi ibk ibr ibs icb icc ice ich ici ick icr ics ie- iec iee iei iek ier ies ihb ihc ihe ihh ihi ihk ihr ihs iib iic iie iih iii iir iis ikb ikc ike iki ikk ikr iks ir- irb irc ire iri irk irr irs is- isb isc ise ish isi isk isr iss kbb kbc kbe kbh kbi kbk kbr kbs kcb kcc kce kch kci kck kcr kcs ke- keb kec kee keh kei kek ker kes khe khh khi khk khr khs kib kic kie kih kii kik kir kis kkb kkc kke kkh kki kkk kkr kks krc kri krk krr krs ksb ksc kse ksh ksi ksk ksr kss rbb rbc rbe rbh rbi rbk rbr rbs rcb rcc rce rch rci rcr rcs re- reb rec ree reh rei rek rer res rh- rhb rhc rhe rhh rhi rhr rhs rib ric rie rih rii rik rir ris rkb rkc rke rkk rks rrb rrc rrh rri rrk rrr rrs rsb rsc rse rsh rsi rsk rsr rss sbb sbc sbe sbh sbi sbk sbr sbs scb scc sce sch sci sck scr scs se- seb sec see seh sei sek ser ses sh- shb shc she shh shi shk shr shs sib sic sie sih sii sik sir sis sk- skb skc ske skh ski skk skr sks sr- srb src sre srh sri srk srr srs ss- ssb ssc sse ssh ssi ssk ssr sss