-er -ic b-p bbb bbc bbe bbf bbi bbo bbp bbr bbs bcb bcc bce bcf bci bco bcp bcr bcs be- beb bec bee bef bei beo bep ber bes bfb bfc bfe bff bfi bfo bfp bfr bfs bi- bib bic bie bif bii bio bip bir bis bob boc boe bof boi boo bop bor bos bpb bpc bpe bpf bpi bpo bpp bpr bps brb bre brf bri bro brp brr brs bsb bsc bse bsf bsi bso bsp bsr bss c-- cbb cbc cbe cbf cbi cbo cbp cbr cbs ccb ccc cce ccf cci cco ccp ccr ccs ce- ceb cec cee cef cei ceo cep cer ces cfb cfc cfe cff cfi cfo cfp cfr cfs ci- cib cic cie cif cii cio cip cir cis co- cob coc coe cof coi coo cop cor cos cpb cpc cpe cpf cpi cpo cpp cpr cps crb crc cre crf cri cro crp crr crs csb csc cse csf csi cso csp csr css ebb ebc ebe ebf ebi ebo ebp ebr ebs ec- ecb ecc ece ecf eci eco ecr ecs eeb eec eee eef eeo eep eer ees ef- efb efc efe eff efi efo efp efr efs eib eic eie eif eii eio eip eir eis eo- eob eoc eoe eof eoi eoo eop eor eos ep- epb epc epe epf epi epo epp epr eps erb erc ere erf eri ero erp err ers es- esb esc ese esf esi eso esp esr ess fbb fbc fbe fbf fbi fbo fbp fbr fbs fcb fcc fce fcf fci fco fcp fcr fcs feb fec fee fef fei feo fep fer fes ffc ffe fff ffi ffo ffp ffr ffs fib fic fie fif fii fip fir fis fob foc foe fof foi foo fop for fos fpb fpc fpe fpi fpo fpp fpr fps frb frc fre frf fri fro frp frr frs fsb fsc fse fsf fsi fso fsp fsr fss i-f ibb ibc ibe ibf ibi ibo ibp ibr ibs icb icc ice icf ici ico icp icr ics ie- iec iee ief iei iep ier ies ifb ifc ife iff ifi ifo ifp ifr ifs iib iic iie iif iii iio iip iir iis io- iob ioc ioe iof ioi ioo iop ior ios ipb ipc ipe ipf ipi ipo ipp ipr ips ir- irb irc ire irf iri iro irp irr irs is- isb isc ise isf isi iso isp isr iss o-i ob- obb obc obe obf obi obo obp obr obs oc- ocb occ ocf oci oco ocp ocr ocs oeb oec oee oef oei oeo oep oer oes of- ofb ofc ofe off ofi ofo ofp ofr ofs oib oic oie oif oii oio oip oir ois oo- oob ooc oof ooi ooo oop oor oos op- opb opc ope opf opi opo opp opr ops or- orb orc ore orf ori oro orp orr ors os- osb osc ose osf osi oso osp osr oss p-p pbb pbc pbe pbf pbi pbo pbp pbr pbs pcb pcc pce pcf pci pco pcp pcr pcs peb pec pee pef pei peo pep per pes pfb pfc pfe pff pfi pfo pfp pfr pfs pib pic pie pif pii pio pip pir pis pob poc poe pof poi poo pop por pos ppb ppc ppe ppf ppi ppo ppp ppr pps prb prc pre prf pri pro prp prr prs ps- psb psc pse psf psi pso psp psr pss rbb rbc rbe rbf rbi rbo rbp rbr rbs rcb rcc rce rcf rci rco rcp rcr rcs re- reb rec ree ref rei reo rep rer res rfb rfc rfe rff rfi rfo rfp rfr rfs rib ric rie rif rii rio rip rir ris rob roc roe rof roi roo rop ror ros rpb rpc rpe rpf rpi rpo rpp rpr rps rrb rrc rrf rri rrp rrr rrs rsb rsc rse rsf rsi rso rsp rsr rss sbb sbc sbe sbf sbi sbo sbp sbr sbs scb scc sce scf sci sco scp scr scs se- seb sec see sef sei seo sep ser ses sfb sfc sfe sff sfi sfo sfp sfr sfs sib sic sie sif sii sio sip sir sis sob soc soe sof soi soo sop sor sos spb spc spe spf spi spo spp spr sps sr- srb src sre srf sri sro srp srr srs ss- ssb ssc sse ssf ssi sso ssp ssr sss