-er -ic a-a a-c a-i aaa aac aad aae aag aai aar aas ac- aca acc acd ace acg aci acr acs ad- ada adc add ade adg adi adr ads aea aec aed aee aeg aei aer aes ag- aga agc agd age agg agi agr ags ai- aia aic aid aie aig aii air ais ar- ara arc ard are arg ari arr ars as- asa asc asd ase asg asi asr ass c-- caa cac cad cae cag cai car cas cca ccc ccd cce ccg cci ccr ccs cda cdc cdd cde cdg cdi cdr cds ce- cea cec ced cee ceg cei cer ces cga cgc cgd cge cgg cgi cgr cgs ci- cia cic cid cie cig cii cir cis cra crc crd cre crg cri crr crs csa csc csd cse csg csi csr css daa dac dad dae dag dai dar das dca dcc dcd dce dcg dci dcr dcs dda ddc ddd dde ddg ddi ddr dds de- dea dec ded dee deg dei der des dga dgc dgd dge dgg dgi dgr dgs di- dia dic did die dig dii dir dis dra drc drd dre drg dri drr drs dsa dsc dsd dse dsg dsi dsr dss eaa eac ead eae eag eai ear eas ec- eca ecc ecd ece ecg eci ecr ecs ed- eda edc edd ede edg edi edr eds eea eec eed eee eeg eer ees ega egc egd ege egg egi egr egs eia eic eid eie eig eii eir eis era erc erd ere erg eri err ers es- esa esc esd ese esg esi esr ess g-d gaa gac gad gae gag gai gar gas gca gcc gcd gce gcg gci gcr gcs gda gdc gdd gde gdi gdr gds ge- gea gec ged gee geg gei ger ges gga ggc ggd ggg ggi ggr ggs gia gic gid gie gig gii gir gis gra grc grd gre grg gri grr grs gsa gsc gsd gse gsg gsi gsr gss i-d ia- iaa iac iad iae iag iai iar ias ica icc icd ice icg ici icr ics ida idc idd ide idg idi idr ids ie- iea iec ied iee ieg iei ier ies iga igc igd ige igg igi igr igs iia iic iid iie iii iir iis ir- ira irc ird ire irg iri irr irs is- isa isc isd ise isg isi isr iss ra- raa rac rad rae rag rai rar ras rca rcc rcd rce rcg rci rcr rcs rda rdc rdd rde rdg rdi rdr rds re- rea rec red ree reg rei rer res rga rgc rgd rge rgg rgi rgr rgs ria ric rid rie rig rii rir ris rra rrc rrd rrg rri rrr rrs rsa rsc rsd rse rsg rsi rsr rss saa sac sad sae sag sai sar sas sca scc scd sce scg sci scr scs sda sdc sdd sde sdg sdi sdr sds se- sea sec sed see seg sei ser ses sga sgc sgd sge sgg sgi sgr sgs sia sic sid sie sig sii sir sis sr- sra src srd sre srg sri srr srs ss- ssa ssc ssd sse ssg ssi ssr sss