-er -ic a-a a-c a-i aaa aac aad aae aag aai aak aar ac- aca acc acd ace acg aci ack acr ad- ada adc add ade adg adi adk adr aea aec aed aee aeg aei aek aer ag- aga agc agd age agg agi agk agr ai- aia aic aid aie aig aii aik air aka akc akd ake akg aki akk akr ar- ara arc ard are arg ari ark arr c-- caa cac cad cae cag cai cak car cca ccc ccd cce ccg cci cck ccr cda cdc cdd cde cdg cdi cdk cdr ce- cea cec ced cee ceg cei cek cer cga cgc cgd cge cgg cgi cgr ci- cia cic cid cie cig cii cik cir cka ckc ckd cki cra crc crd cre crg cri crk crr daa dac dad dae dag dai dak dar dca dcc dcd dce dcg dci dck dcr dda ddc ddd dde ddg ddi ddk ddr de- dea dec ded dee deg dei dek der dga dgc dgd dge dgg dgi dgk dgr di- dia dic did die dig dii dik dir dka dkc dke dkg dki dkk dkr dra drc drd dre drg dri drk drr eaa eac ead eae eag eai eak ear ec- eca ecc ecd ece ecg eci eck ecr ed- eda edc edd ede edg edi edk edr eea eec eed eee eeg eek eer ega egc egd ege egg egi egr eia eic eid eie eig eii eik eir eka ekc ekd eke ekg eki ekr era erc erd ere erg eri erk err g-d gaa gac gad gae gag gai gak gar gca gcc gcd gce gcg gci gck gcr gda gdc gdd gde gdi gdk gdr ge- gea gec ged gee geg gei gek ger gga ggc ggd ggg ggi ggr gia gic gid gie gig gii gik gir gka gkd gra grc grd gre grg gri grk grr i-d ia- iaa iac iad iae iag iai iar ica icc icd ice icg ici ick icr ida idc idd ide idg idi idk idr ie- iea iec ied iee ieg iei iek ier iga igc igd ige igg igi igk igr iia iic iid iie iii iir ika ikc ike iki ikk ikr ir- ira irc ird ire irg iri irk irr ka- kaa kac kad kae kag kai kak kar kca kcc kcd kce kcg kci kck kcr kda kdc kde kdg kdk kdr ke- kea kec ked kee keg kei kek ker kga kgc kgd kgi kia kic kid kie kig kii kik kir kkc kke kki kkk kkr kra krc krd krg kri krk krr ra- raa rac rad rae rag rai rak rar rca rcc rcd rce rcg rci rcr rda rdc rdd rde rdg rdi rdr re- rea rec red ree reg rei rek rer rga rgc rgd rge rgg rgi rgk rgr ria ric rid rie rig rii rik rir rkc rke rkg rkk rra rrc rrd rrg rri rrk rrr