-er -ic a-a a-c a-i aaa aac aae aag aai aak aap aar ac- aca acc ace acg aci ack acp acr aea aec aee aeg aei aek aep aer ag- aga agc age agg agi agk agp agr ai- aia aic aie aig aii aik aip air aka akc ake akg aki akk akp akr ap- apa apc ape apg api apk app apr ar- ara arc are arg ari ark arp arr c-- caa cac cae cag cai cak cap car cca ccc cce ccg cci cck ccp ccr ce- cea cec cee ceg cei cek cep cer cga cgc cge cgg cgi cgp cgr ci- cia cic cie cig cii cik cip cir cka ckc cki cpa cpc cpe cpg cpi cpk cpp cpr cra crc cre crg cri crk crp crr eaa eac eae eag eai eak eap ear ec- eca ecc ece ecg eci eck ecr eea eec eee eeg eek eep eer ega egc ege egg egi egp egr eia eic eie eig eii eik eip eir eka ekc eke ekg eki ekp ekr ep- epa epc epe epg epi epp epr era erc ere erg eri erk erp err g-p gaa gac gae gag gai gak gap gar gca gcc gce gcg gci gck gcp gcr ge- gea gec gee geg gei gek gep ger gga ggc ggg ggi ggp ggr gia gic gie gig gii gik gip gir gka gkp gpa gpc gpe gpg gpi gpk gpp gpr gra grc gre grg gri grk grp grr ia- iaa iac iae iag iai iap iar ica icc ice icg ici ick icp icr ie- iea iec iee ieg iei iek iep ier iga igc ige igg igi igk igp igr iia iic iie iii iip iir ika ikc ike iki ikk ikr ipa ipc ipe ipg ipi ipp ipr ir- ira irc ire irg iri irk irp irr ka- kaa kac kae kag kai kak kap kar kca kcc kce kcg kci kck kcp kcr ke- kea kec kee keg kei kek kep ker kga kgc kgi kgp kia kic kie kig kii kik kip kir kkc kke kki kkk kkp kkr kpa kpc kpe kpi kpk kpp kpr kra krc krg kri krk krp krr p-p paa pac pae pag pai pak pap par pca pcc pce pcg pci pck pcp pcr pea pec pee peg pei pek pep per pga pgc pge pgg pgi pgk pgp pgr pia pic pie pig pii pik pip pir pka pkc pke pkg pki pkp pkr ppa ppc ppe ppg ppi ppk ppp ppr pra prc pre prg pri prk prp prr ra- raa rac rae rag rai rak rap rar rca rcc rce rcg rci rcp rcr re- rea rec ree reg rei rek rep rer rga rgc rge rgg rgi rgk rgp rgr ria ric rie rig rii rik rip rir rkc rke rkg rkk rkp rpa rpc rpe rpg rpi rpk rpp rpr rra rrc rrg rri rrk rrp rrr