-er -ic b-p bbb bbc bbd bbe bbi bbo bbp bbr bbs bcb bcc bcd bce bci bco bcp bcr bcs bdb bdc bdd bde bdi bdo bdp bdr bds be- beb bec bed bee bei beo bep ber bes bi- bib bic bid bie bii bio bip bir bis bob boc bod boe boi boo bop bor bos bpb bpc bpd bpe bpi bpo bpp bpr bps brb brd bre bri bro brp brr brs bsb bsc bsd bse bsi bso bsp bsr bss c-- cbb cbc cbd cbe cbi cbo cbp cbr cbs ccb ccc ccd cce cci cco ccp ccr ccs cdb cdc cdd cde cdi cdo cdp cdr cds ce- ceb cec ced cee cei ceo cep cer ces ci- cib cic cid cie cii cio cip cir cis co- cob coc cod coe coi coo cop cor cos cpb cpc cpd cpe cpi cpo cpp cpr cps crb crc crd cre cri cro crp crr crs csb csc csd cse csi cso csp csr css dbb dbc dbd dbe dbi dbo dbp dbr dbs dcb dcc dcd dce dci dco dcp dcr dcs ddb ddc ddd dde ddi ddo ddp ddr dds de- deb dec ded dee dei deo dep der des di- dib dic did die dii dio dip dir dis dob doc dod doe doi doo dop dor dos dpb dpc dpd dpe dpi dpo dpp dpr dps drb drc drd dre dri dro drp drr drs dsb dsc dsd dse dsi dso dsp dsr dss ebb ebc ebd ebe ebi ebo ebp ebr ebs ec- ecb ecc ecd ece eci eco ecr ecs ed- edb edc edd ede edi edo edp edr eds eeb eec eed eee eeo eep eer ees eib eic eid eie eii eio eip eir eis eo- eob eoc eod eoe eoi eoo eop eor eos ep- epb epc epd epe epi epo epp epr eps erb erc erd ere eri ero erp err ers es- esb esc esd ese esi eso esp esr ess i-d ibb ibc ibd ibe ibi ibo ibp ibr ibs icb icc icd ice ici ico icp icr ics idb idc idd ide idi ido idp idr ids ie- iec ied iee iei iep ier ies iib iic iid iie iii iio iip iir iis io- iob ioc iod ioe ioi ioo iop ior ios ipb ipc ipd ipe ipi ipo ipp ipr ips ir- irb irc ird ire iri iro irp irr irs is- isb isc isd ise isi iso isp isr iss o-i ob- obb obc obd obe obi obo obp obr obs oc- ocb occ ocd oci oco ocp ocr ocs odb odc odd ode odi odo odp odr ods oeb oec oed oee oei oeo oep oer oes oib oic oid oie oii oio oip oir ois oo- oob ooc ood ooi ooo oop oor oos op- opb opc opd ope opi opo opp opr ops or- orb orc ord ore ori oro orp orr ors os- osb osc osd ose osi oso osp osr oss p-p pbb pbc pbd pbe pbi pbo pbp pbr pbs pcb pcc pcd pce pci pco pcp pcr pcs pdb pdc pdd pde pdi pdo pdp pdr pds peb pec ped pee pei peo pep per pes pib pic pid pie pii pio pip pir pis pob poc pod poe poi poo pop por pos ppb ppc ppd ppe ppi ppo ppp ppr pps prb prc prd pre pri pro prp prr prs ps- psb psc psd pse psi pso psp psr pss rbb rbc rbd rbe rbi rbo rbp rbr rbs rcb rcc rcd rce rci rco rcp rcr rcs rdb rdc rdd rde rdi rdo rdp rdr rds re- reb rec red ree rei reo rep rer res rib ric rid rie rii rio rip rir ris rob roc rod roe roi roo rop ror ros rpb rpc rpd rpe rpi rpo rpp rpr rps rrb rrc rrd rri rrp rrr rrs rsb rsc rsd rse rsi rso rsp rsr rss sbb sbc sbd sbe sbi sbo sbp sbr sbs scb scc scd sce sci sco scp scr scs sdb sdc sdd sde sdi sdo sdp sdr sds se- seb sec sed see sei seo sep ser ses sib sic sid sie sii sio sip sir sis sob soc sod soe soi soo sop sor sos spb spc spd spe spi spo spp spr sps sr- srb src srd sre sri sro srp srr srs ss- ssb ssc ssd sse ssi sso ssp ssr sss