-er -ic a-a a-c a-i aaa aac aae aaf aai aao aap aar aas ac- aca acc ace acf aci aco acp acr acs aea aec aee aef aei aeo aep aer aes af- afa afc afe aff afi afo afp afr afs ai- aia aic aie aif aii aio aip air ais aoa aoc aoe aof aoi aoo aop aor aos ap- apa apc ape apf api apo app apr aps ar- ara arc are arf ari aro arp arr ars as- asa asc ase asf asi aso asp asr ass c-- caa cac cae caf cai cao cap car cas cca ccc cce ccf cci cco ccp ccr ccs ce- cea cec cee cef cei ceo cep cer ces cfa cfc cfe cff cfi cfo cfp cfr cfs ci- cia cic cie cif cii cio cip cir cis co- coa coc coe cof coi coo cop cor cos cpa cpc cpe cpf cpi cpo cpp cpr cps cra crc cre crf cri cro crp crr crs csa csc cse csf csi cso csp csr css eaa eac eae eaf eai eao eap ear eas ec- eca ecc ece ecf eci eco ecr ecs eea eec eee eef eeo eep eer ees ef- efa efc efe eff efi efo efp efr efs eia eic eie eif eii eio eip eir eis eo- eoa eoc eoe eof eoi eoo eop eor eos ep- epa epc epe epf epi epo epp epr eps era erc ere erf eri ero erp err ers es- esa esc ese esf esi eso esp esr ess faa fac fae faf fai fao fap far fas fca fcc fce fcf fci fco fcp fcr fcs fea fec fee fef fei feo fep fer fes ffa ffc ffe fff ffi ffo ffp ffr ffs fia fic fie fif fii fip fir fis foa foc foe fof foi foo fop for fos fpa fpc fpe fpi fpo fpp fpr fps fra frc fre frf fri fro frp frr frs fsa fsc fse fsf fsi fso fsp fsr fss i-f ia- iaa iac iae iaf iai iao iap iar ias ica icc ice icf ici ico icp icr ics ie- iea iec iee ief iei iep ier ies ifa ifc ife iff ifi ifo ifp ifr ifs iia iic iie iif iii iio iip iir iis io- ioa ioc ioe iof ioi ioo iop ior ios ipa ipc ipe ipf ipi ipo ipp ipr ips ir- ira irc ire irf iri iro irp irr irs is- isa isc ise isf isi iso isp isr iss o-i oaa oac oae oaf oai oao oap oar oas oc- oca occ ocf oci oco ocp ocr ocs oea oec oee oef oei oeo oep oer oes of- ofa ofc ofe off ofi ofo ofp ofr ofs oia oic oie oif oii oio oip oir ois oo- ooa ooc oof ooi ooo oop oor oos op- opa opc ope opf opi opo opp opr ops or- ora orc ore orf ori oro orp orr ors os- osa osc ose osf osi oso osp osr oss p-p paa pac pae paf pai pao pap par pas pca pcc pce pcf pci pco pcp pcr pcs pea pec pee pef pei peo pep per pes pfa pfc pfe pff pfi pfo pfp pfr pfs pia pic pie pif pii pio pip pir pis poa poc poe pof poi poo pop por pos ppa ppc ppe ppf ppi ppo ppp ppr pps pra prc pre prf pri pro prp prr prs ps- psa psc pse psf psi pso psp psr pss ra- raa rac rae raf rai rao rap rar ras rca rcc rce rcf rci rco rcp rcr rcs re- rea rec ree ref rei reo rep rer res rfa rfc rfe rff rfi rfo rfp rfr rfs ria ric rie rif rii rio rip rir ris roa roc roe rof roi roo rop ror ros rpa rpc rpe rpf rpi rpo rpp rpr rps rra rrc rrf rri rrp rrr rrs rsa rsc rse rsf rsi rso rsp rsr rss saa sac sae saf sai sao sap sar sas sca scc sce scf sci sco scp scr scs se- sea sec see sef sei seo sep ser ses sfa sfc sfe sff sfi sfo sfp sfr sfs sia sic sie sif sii sio sip sir sis soa soc soe sof soi soo sop sor sos spa spc spe spf spi spo spp spr sps sr- sra src sre srf sri sro srp srr srs ss- ssa ssc sse ssf ssi sso ssp ssr sss