-er -ic a-a a-c a-i aaa aac aae aag aai aap aar aas ac- aca acc ace acg aci acp acr acs aea aec aee aeg aei aep aer aes ag- aga agc age agg agi agp agr ags ai- aia aic aie aig aii aip air ais ap- apa apc ape apg api app apr aps ar- ara arc are arg ari arp arr ars as- asa asc ase asg asi asp asr ass c-- caa cac cae cag cai cap car cas cca ccc cce ccg cci ccp ccr ccs ce- cea cec cee ceg cei cep cer ces cga cgc cge cgg cgi cgp cgr cgs ci- cia cic cie cig cii cip cir cis cpa cpc cpe cpg cpi cpp cpr cps cra crc cre crg cri crp crr crs csa csc cse csg csi csp csr css eaa eac eae eag eai eap ear eas ec- eca ecc ece ecg eci ecr ecs eea eec eee eeg eep eer ees ega egc ege egg egi egp egr egs eia eic eie eig eii eip eir eis ep- epa epc epe epg epi epp epr eps era erc ere erg eri erp err ers es- esa esc ese esg esi esp esr ess g-p gaa gac gae gag gai gap gar gas gca gcc gce gcg gci gcp gcr gcs ge- gea gec gee geg gei gep ger ges gga ggc ggg ggi ggp ggr ggs gia gic gie gig gii gip gir gis gpa gpc gpe gpg gpi gpp gpr gps gra grc gre grg gri grp grr grs gsa gsc gse gsg gsi gsp gsr gss ia- iaa iac iae iag iai iap iar ias ica icc ice icg ici icp icr ics ie- iea iec iee ieg iei iep ier ies iga igc ige igg igi igp igr igs iia iic iie iii iip iir iis ipa ipc ipe ipg ipi ipp ipr ips ir- ira irc ire irg iri irp irr irs is- isa isc ise isg isi isp isr iss p-p paa pac pae pag pai pap par pas pca pcc pce pcg pci pcp pcr pcs pea pec pee peg pei pep per pes pga pgc pge pgg pgi pgp pgr pgs pia pic pie pig pii pip pir pis ppa ppc ppe ppg ppi ppp ppr pps pra prc pre prg pri prp prr prs ps- psa psc pse psg psi psp psr pss ra- raa rac rae rag rai rap rar ras rca rcc rce rcg rci rcp rcr rcs re- rea rec ree reg rei rep rer res rga rgc rge rgg rgi rgp rgr rgs ria ric rie rig rii rip rir ris rpa rpc rpe rpg rpi rpp rpr rps rra rrc rrg rri rrp rrr rrs rsa rsc rse rsg rsi rsp rsr rss saa sac sae sag sai sap sar sas sca scc sce scg sci scp scr scs se- sea sec see seg sei sep ser ses sga sgc sge sgg sgi sgp sgr sgs sia sic sie sig sii sip sir sis spa spc spe spg spi spp spr sps sr- sra src sre srg sri srp srr srs ss- ssa ssc sse ssg ssi ssp ssr sss