-er -ic a-a a-c a-i aaa aac aae aag aai aar ac- aca acc ace acg aci acr aea aec aee aeg aei aer ag- aga agc age agg agi agr ai- aia aic aie aig aii air ar- ara arc are arg ari arr c-- caa cac cae cag cai car cca ccc cce ccg cci ccr ce- cea cec cee ceg cei cer cga cgc cge cgg cgi cgr ci- cia cic cie cig cii cir cra crc cre crg cri crr eaa eac eae eag eai ear ec- eca ecc ece ecg eci ecr eea eec eee eeg eer ega egc ege egg egi egr eia eic eie eig eii eir era erc ere erg eri err gaa gac gae gag gai gar gca gcc gce gcg gci gcr ge- gea gec gee geg gei ger gga ggc ggg ggi ggr gia gic gie gig gii gir gra grc gre grg gri grr ia- iaa iac iae iag iai iar ica icc ice icg ici icr ie- iea iec iee ieg iei ier iga igc ige igg igi igr iia iic iie iii iir ir- ira irc ire irg iri irr ra- raa rac rae rag rai rar rca rcc rce rcg rci rcr re- rea rec ree reg rei rer rga rgc rge rgg rgi rgr ria ric rie rig rii rir rra rrc rrg rri rrr