-er -ic a-a a-c a-i a-t aaa aac aad aae aag aai aap aar aas aat ac- aca acc acd ace acg aci acp acr acs act ad- ada adc add ade adg adi adp adr ads adt aea aec aed aee aeg aei aep aer aes aet ag- aga agc agd age agg agi agp agr ags agt ai- aia aic aid aie aig aii aip air ais ait ap- apa apc apd ape apg api app apr aps apt ar- ara arc ard are arg ari arp arr ars art as- asa asc asd ase asg asi asp asr ass ast at- ata atc atd ate atg ati atp atr ats att c-- caa cac cad cae cag cai cap car cas cat cca ccc ccd cce ccg cci ccp ccr ccs cct cda cdc cdd cde cdg cdi cdp cdr cds cdt ce- cea cec ced cee ceg cei cep cer ces cet cga cgc cgd cge cgg cgi cgp cgr cgs cgt ci- cia cic cid cie cig cii cip cir cis cit cpa cpc cpd cpe cpg cpi cpp cpr cps cpt cra crc crd cre crg cri crp crr crs crt csa csc csd cse csg csi csp csr css cst cta ctc ctd cte ctg cti ctp ctr cts ctt daa dac dad dae dag dai dap dar das dat dca dcc dcd dce dcg dci dcp dcr dcs dct dda ddc ddd dde ddg ddi ddp ddr dds ddt de- dea dec ded dee deg dei dep der des det dga dgc dgd dge dgg dgi dgp dgr dgs dgt di- dia dic did die dig dii dip dir dis dit dpa dpc dpd dpe dpg dpi dpp dpr dps dpt dra drc drd dre drg dri drp drr drs drt dsa dsc dsd dse dsg dsi dsp dsr dss dst dta dtc dtd dte dtg dti dtp dtr dts dtt eaa eac ead eae eag eai eap ear eas eat ec- eca ecc ecd ece ecg eci ecr ecs ect ed- eda edc edd ede edg edi edp edr eds edt eea eec eed eee eeg eep eer ees eet ega egc egd ege egg egi egp egr egs egt eia eic eid eie eig eii eip eir eis eit ep- epa epc epd epe epg epi epp epr eps ept era erc erd ere erg eri erp err ers ert es- esa esc esd ese esg esi esp esr ess est eta etc etd ete etg eti etp etr ets ett g-d g-p gaa gac gad gae gag gai gap gar gas gat gca gcc gcd gce gcg gci gcp gcr gcs gct gda gdc gdd gde gdi gdp gdr gds gdt ge- gea gec ged gee geg gei gep ger ges get gga ggc ggd ggg ggi ggp ggr ggs ggt gia gic gid gie gig gii gip gir gis git gpa gpc gpd gpe gpg gpi gpp gpr gps gpt gra grc grd gre grg gri grp grr grs grt gsa gsc gsd gse gsg gsi gsp gsr gss gst gta gtc gtd gte gtg gti gtp gtr gts gtt i-d ia- iaa iac iad iae iag iai iap iar ias iat ica icc icd ice icg ici icp icr ics ict ida idc idd ide idg idi idp idr ids idt ie- iea iec ied iee ieg iei iep ier ies iet iga igc igd ige igg igi igp igr igs igt iia iic iid iie iii iip iir iis iit ipa ipc ipd ipe ipg ipi ipp ipr ips ipt ir- ira irc ird ire irg iri irp irr irs irt is- isa isc isd ise isg isi isp isr iss ist ita itc itd ite itg iti itp its itt p-p paa pac pad pae pag pai pap par pas pat pca pcc pcd pce pcg pci pcp pcr pcs pct pda pdc pdd pde pdg pdi pdp pdr pds pdt pea pec ped pee peg pei pep per pes pet pga pgc pgd pge pgg pgi pgp pgr pgs pgt pia pic pid pie pig pii pip pir pis pit ppa ppc ppd ppe ppg ppi ppp ppr pps ppt pra prc prd pre prg pri prp prr prs prt ps- psa psc psd pse psg psi psp psr pss pst pt- pta ptc ptd pte ptg pti ptp ptr pts ptt ra- raa rac rad rae rag rai rap rar ras rat rca rcc rcd rce rcg rci rcp rcr rcs rct rda rdc rdd rde rdg rdi rdp rdr rds rdt re- rea rec red ree reg rei rep rer res ret rga rgc rgd rge rgg rgi rgp rgr rgs rgt ria ric rid rie rig rii rip rir ris rit rpa rpc rpd rpe rpg rpi rpp rpr rps rpt rra rrc rrd rrg rri rrp rrr rrs rrt rsa rsc rsd rse rsg rsi rsp rsr rss rst rta rtc rtd rte rtg rti rtp rtr rts rtt saa sac sad sae sag sai sap sar sas sat sca scc scd sce scg sci scp scr scs sct sda sdc sdd sde sdg sdi sdp sdr sds sdt se- sea sec sed see seg sei sep ser ses set sga sgc sgd sge sgg sgi sgp sgr sgs sgt sia sic sid sie sig sii sip sir sis sit spa spc spd spe spg spi spp spr sps spt sr- sra src srd sre srg sri srp srr srs srt ss- ssa ssc ssd sse ssg ssi ssp ssr sss sst sta stc std ste stg sti stp str sts stt taa tac tad tae tag tai tap tar tas tat tca tcc tcd tce tcg tci tcp tcr tcs tct tda tdc tdd tde tdg tdi tdp tdr tds tdt te- tea tec ted tee teg tei tep ter tes tet tga tgc tge tgg tgi tgp tgr tgs tgt tia tic tid tie tig tii tip tir tis tit tpa tpc tpd tpe tpg tpi tpp tpr