-er -ic a-a a-c a-i aaa aac aae aag aai aao aap aar aas ac- aca acc ace acg aci aco acp acr acs aea aec aee aeg aei aeo aep aer aes ag- aga agc age agg agi ago agp agr ags ai- aia aic aie aig aii aio aip air ais aoa aoc aoe aog aoi aoo aop aor aos ap- apa apc ape apg api apo app apr aps ar- ara arc are arg ari aro arp arr ars as- asa asc ase asg asi aso asp asr ass c-- caa cac cae cag cai cao cap car cas cca ccc cce ccg cci cco ccp ccr ccs ce- cea cec cee ceg cei ceo cep cer ces cga cgc cge cgg cgi cgo cgp cgr cgs ci- cia cic cie cig cii cio cip cir cis co- coa coc coe cog coi coo cop cor cos cpa cpc cpe cpg cpi cpo cpp cpr cps cra crc cre crg cri cro crp crr crs csa csc cse csg csi cso csp csr css eaa eac eae eag eai eao eap ear eas ec- eca ecc ece ecg eci eco ecr ecs eea eec eee eeg eeo eep eer ees ega egc ege egg egi ego egp egr egs eia eic eie eig eii eio eip eir eis eo- eoa eoc eoe eog eoi eoo eop eor eos ep- epa epc epe epg epi epo epp epr eps era erc ere erg eri ero erp err ers es- esa esc ese esg esi eso esp esr ess g-p gaa gac gae gag gai gao gap gar gas gca gcc gce gcg gci gco gcp gcr gcs ge- gea gec gee geg gei geo gep ger ges gga ggc ggg ggi ggo ggp ggr ggs gia gic gie gig gii gio gip gir gis goa goc goe gog goi goo gop gor gos gpa gpc gpe gpg gpi gpo gpp gpr gps gra grc gre grg gri gro grp grr grs gsa gsc gse gsg gsi gso gsp gsr gss ia- iaa iac iae iag iai iao iap iar ias ica icc ice icg ici ico icp icr ics ie- iea iec iee ieg iei iep ier ies iga igc ige igg igi igo igp igr igs iia iic iie iii iio iip iir iis io- ioa ioc ioe iog ioi ioo iop ior ios ipa ipc ipe ipg ipi ipo ipp ipr ips ir- ira irc ire irg iri iro irp irr irs is- isa isc ise isg isi iso isp isr iss o-i oaa oac oae oag oai oao oap oar oas oc- oca occ ocg oci oco ocp ocr ocs oea oec oee oeg oei oeo oep oer oes oga ogc oge ogg ogi ogo ogp ogs oia oic oie oii oio oip oir ois oo- ooa ooc oog ooi ooo oop oor oos op- opa opc ope opg opi opo opp opr ops or- ora orc ore org ori oro orp orr ors os- osa osc ose osg osi oso osp osr oss p-p paa pac pae pag pai pao pap par pas pca pcc pce pcg pci pco pcp pcr pcs pea pec pee peg pei peo pep per pes pga pgc pge pgg pgi pgo pgp pgr pgs pia pic pie pig pii pio pip pir pis poa poc poe pog poi poo pop por pos ppa ppc ppe ppg ppi ppo ppp ppr pps pra prc pre prg pri pro prp prr prs ps- psa psc pse psg psi pso psp psr pss ra- raa rac rae rag rai rao rap rar ras rca rcc rce rcg rci rco rcp rcr rcs re- rea rec ree reg rei reo rep rer res rga rgc rge rgg rgi rgo rgp rgr rgs ria ric rie rig rii rio rip rir ris roa roc roe rog roi roo rop ror ros rpa rpc rpe rpg rpi rpo rpp rpr rps rra rrc rrg rri rrp rrr rrs rsa rsc rse rsg rsi rso rsp rsr rss saa sac sae sag sai sao sap sar sas sca scc sce scg sci sco scp scr scs se- sea sec see seg sei seo sep ser ses sga sgc sge sgg sgi sgo sgp sgr sgs sia sic sie sig sii sio sip sir sis soa soc soe sog soi soo sop sor sos spa spc spe spg spi spo spp spr sps sr- sra src sre srg sri sro srp srr srs ss- ssa ssc sse ssg ssi sso ssp ssr sss