-er b-p bbb bbc bbe bbh bbl bbp bbr bbs bcb bcc bce bch bcl bcp bcr bcs be- beb bec bee beh bel bep ber bes bhb bhc bhe bhh bhl bhp bhr bhs blb blc ble blh bll blp blr bls bpb bpc bpe bph bpl bpp bpr bps brb bre brh brl brp brr brs bsb bsc bse bsh bsl bsp bsr bss c-- cbb cbc cbe cbh cbl cbp cbr cbs ccb ccc cce cch ccl ccp ccr ccs ce- ceb cec cee ceh cel cep cer ces ch- chb chc che chh chl chp chr chs cl- clb clc cle clh cll clp clr cls cpb cpc cpe cph cpl cpp cpr cps crb crc cre crh crl crp crr crs csb csc cse csh csl csp csr css ebb ebc ebe ebh ebl ebp ebr ebs ec- ecb ecc ece ech ecl ecr ecs eeb eec eee eel eep eer ees ehb ehc ehe ehh ehl ehp ehr ehs elb elc ele elh ell elp elr els ep- epb epc epe eph epl epp epr eps erb erc ere erh erl erp err ers es- esb esc ese esh esl esp esr ess hbb hbc hbe hbh hbl hbp hbr hbs hcb hcc hce hch hcl hcp hcr hcs he- heb hec hee heh hel hep her hes hhb hhc hhe hhh hhl hhp hhr hhs hlb hlc hle hlh hll hlp hlr hls hpb hpc hpe hph hpl hpp hpr hps hr- hrb hrc hre hrh hrl hrp hrr hrs hsb hsc hse hsh hsl hsp hsr hss l-p lbb lbc lbe lbh lbl lbp lbr lbs lcb lcc lce lch lcl lcp lcr lcs leb lec lee leh lel lep ler les lhb lhc lhh lhp lhr lhs llb llc lle lll llp llr lls lpb lpc lpe lph lpl lpp lpr lps lrb lrc lrh lrp lrr lrs lsb lsc lse lsh lsl lsp lsr lss p-p pbb pbc pbe pbl pbp pbr pbs pcb pcc pce pch pcl pcp pcr pcs peb pec pee peh pel pep per pes phb phc phe phl php phr phs plb plc ple plh pll plp plr pls ppb ppc ppe pph ppl ppp ppr pps prb prc pre prh prl prp prr prs ps- psb psc pse psh psl psp psr pss rbb rbc rbe rbh rbl rbp rbr rbs rcb rcc rce rch rcl rcp rcr rcs re- reb rec ree reh rel rep rer res rh- rhb rhc rhe rhh rhl rhp rhr rhs rlc rle rlh rll rlp rlr rls rpb rpc rpe rph rpl rpp rpr rps rrb rrc rrh rrl rrp rrr rrs rsb rsc rse rsh rsl rsp rsr rss sbb sbc sbe sbh sbl sbp sbr sbs scb scc sce sch scl scp scr scs se- seb sec see seh sel sep ser ses sh- shb shc she shh shl shp shr shs slb slc sle slh sll slp slr sls spb spc spe sph spl spp spr sps sr- srb src sre srh srl srp srr srs ss- ssb ssc sse ssh ssl ssp ssr sss