-er -ic a-a a-c a-i aaa aac aae aag aai aap aar ac- aca acc ace acg aci acp acr aea aec aee aeg aei aep aer ag- aga agc age agg agi agp agr ai- aia aic aie aig aii aip air ap- apa apc ape apg api app apr ar- ara arc are arg ari arp arr c-- caa cac cae cag cai cap car cca ccc cce ccg cci ccp ccr ce- cea cec cee ceg cei cep cer cga cgc cge cgg cgi cgp cgr ci- cia cic cie cig cii cip cir cpa cpc cpe cpg cpi cpp cpr cra crc cre crg cri crp crr eaa eac eae eag eai eap ear ec- eca ecc ece ecg eci ecr eea eec eee eeg eep eer ega egc ege egg egi egp egr eia eic eie eig eii eip eir ep- epa epc epe epg epi epp epr era erc ere erg eri erp err g-p gaa gac gae gag gai gap gar gca gcc gce gcg gci gcp gcr ge- gea gec gee geg gei gep ger gga ggc ggg ggi ggp ggr gia gic gie gig gii gip gir gpa gpc gpe gpg gpi gpp gpr gra grc gre grg gri grp grr ia- iaa iac iae iag iai iap iar ica icc ice icg ici icp icr ie- iea iec iee ieg iei iep ier iga igc ige igg igi igp igr iia iic iie iii iip iir ipa ipc ipe ipg ipi ipp ipr ir- ira irc ire irg iri irp irr p-p paa pac pae pag pai pap par pca pcc pce pcg pci pcp pcr pea pec pee peg pei pep per pga pgc pge pgg pgi pgp pgr pia pic pie pig pii pip pir ppa ppc ppe ppg ppi ppp ppr pra prc pre prg pri prp prr ra- raa rac rae rag rai rap rar rca rcc rce rcg rci rcp rcr re- rea rec ree reg rei rep rer rga rgc rge rgg rgi rgp rgr ria ric rie rig rii rip rir rpa rpc rpe rpg rpi rpp rpr rra rrc rrg rri rrp rrr