-er -ic b-p bbb bbc bbe bbi bbo bbp bbr bbs bcb bcc bce bci bco bcp bcr bcs be- beb bec bee bei beo bep ber bes bi- bib bic bie bii bio bip bir bis bob boc boe boi boo bop bor bos bpb bpc bpe bpi bpo bpp bpr bps brb bre bri bro brp brr brs bsb bsc bse bsi bso bsp bsr bss c-- cbb cbc cbe cbi cbo cbp cbr cbs ccb ccc cce cci cco ccp ccr ccs ce- ceb cec cee cei ceo cep cer ces ci- cib cic cie cii cio cip cir cis co- cob coc coe coi coo cop cor cos cpb cpc cpe cpi cpo cpp cpr cps crb crc cre cri cro crp crr crs csb csc cse csi cso csp csr css ebb ebc ebe ebi ebo ebp ebr ebs ec- ecb ecc ece eci eco ecr ecs eeb eec eee eeo eep eer ees eib eic eie eii eio eip eir eis eo- eob eoc eoe eoi eoo eop eor eos ep- epb epc epe epi epo epp epr eps erb erc ere eri ero erp err ers es- esb esc ese esi eso esp esr ess ibb ibc ibe ibi ibo ibp ibr ibs icb icc ice ici ico icp icr ics ie- iec iee iei iep ier ies iib iic iie iii iio iip iir iis io- iob ioc ioe ioi ioo iop ior ios ipb ipc ipe ipi ipo ipp ipr ips ir- irb irc ire iri iro irp irr irs is- isb isc ise isi iso isp isr iss o-i ob- obb obc obe obi obo obp obr obs oc- ocb occ oci oco ocp ocr ocs oeb oec oee oei oeo oep oer oes oib oic oie oii oio oip oir ois oo- oob ooc ooi ooo oop oor oos op- opb opc ope opi opo opp opr ops or- orb orc ore ori oro orp orr ors os- osb osc ose osi oso osp osr oss p-p pbb pbc pbe pbi pbo pbp pbr pbs pcb pcc pce pci pco pcp pcr pcs peb pec pee pei peo pep per pes pib pic pie pii pio pip pir pis pob poc poe poi poo pop por pos ppb ppc ppe ppi ppo ppp ppr pps prb prc pre pri pro prp prr prs ps- psb psc pse psi pso psp psr pss rbb rbc rbe rbi rbo rbp rbr rbs rcb rcc rce rci rco rcp rcr rcs re- reb rec ree rei reo rep rer res rib ric rie rii rio rip rir ris rob roc roe roi roo rop ror ros rpb rpc rpe rpi rpo rpp rpr rps rrb rrc rri rrp rrr rrs rsb rsc rse rsi rso rsp rsr rss sbb sbc sbe sbi sbo sbp sbr sbs scb scc sce sci sco scp scr scs se- seb sec see sei seo sep ser ses sib sic sie sii sio sip sir sis sob soc soe soi soo sop sor sos spb spc spe spi spo spp spr sps sr- srb src sre sri sro srp srr srs ss- ssb ssc sse ssi sso ssp ssr sss