-er -ic a-a a-c a-i a-t aaa aac aae aag aai aan aap aar aat ac- aca acc ace acg aci acn acp acr act aea aec aee aeg aei aen aep aer aet ag- aga agc age agg agi agn agp agr agt ai- aia aic aie aig aii ain aip air ait an- ana anc ane ang ani ann anp anr ant ap- apa apc ape apg api apn app apr apt ar- ara arc are arg ari arn arp arr art at- ata atc ate atg ati atn atp atr att c-- caa cac cae cag cai can cap car cat cca ccc cce ccg cci ccn ccp ccr cct ce- cea cec cee ceg cei cen cep cer cet cga cgc cge cgg cgi cgn cgp cgr cgt ci- cia cic cie cig cii cin cip cir cit cn- cna cnc cne cng cni cnn cnp cnr cnt cpa cpc cpe cpg cpi cpn cpp cpr cpt cra crc cre crg cri crn crp crr crt cta ctc cte ctg cti ctn ctp ctr ctt eaa eac eae eag eai ean eap ear eat ec- eca ecc ece ecg eci ecn ecr ect eea eec eee eeg een eep eer eet ega egc ege egg egi egn egp egr egt eia eic eie eig eii ein eip eir eit en- ena enc ene eng eni enn enp enr ent ep- epa epc epe epg epi epn epp epr ept era erc ere erg eri ern erp err ert eta etc ete etg eti etn etp etr ett g-p gaa gac gae gag gai gan gap gar gat gca gcc gce gcg gci gcn gcp gcr gct ge- gea gec gee geg gei gen gep ger get gga ggc ggg ggi ggn ggp ggr ggt gia gic gie gig gii gin gip gir git gna gnc gne gni gnn gnp gnr gnt gpa gpc gpe gpg gpi gpn gpp gpr gpt gra grc gre grg gri grn grp grr grt gta gtc gte gtg gti gtn gtp gtr gtt ia- iaa iac iae iag iai ian iap iar iat ica icc ice icg ici icn icp icr ict ie- iea iec iee ieg iei ien iep ier iet iga igc ige igg igi ign igp igr igt iia iic iie iii iin iip iir iit in- ina inc ine ing ini inn inp inr int ipa ipc ipe ipg ipi ipn ipp ipr ipt ir- ira irc ire irg iri irn irp irr irt ita itc ite itg iti itn itp itt n-i naa nac nae nag nai nan nap nar nat nca ncc nce ncg nci ncn ncp ncr nct ne- nea nec nee neg nei nen nep ner net nga ngc nge ngg ngi ngn ngp ngt nia nic nie nig nii nin nip nir nit nna nnc nne nng nni nnn nnp nnt npa npc npe npg npi npn npp npr npt nra nrc nre nrg nri nrn nrp nrr nrt nta ntc nte ntg nti ntn ntp ntr ntt p-p paa pac pae pag pai pan pap par pat pca pcc pce pcg pci pcn pcp pcr pct pea pec pee peg pei pen pep per pet pga pgc pge pgg pgi pgn pgp pgr pgt pia pic pie pig pii pin pip pir pit pn- pna pnc pne png pni pnn pnp pnr pnt ppa ppc ppe ppg ppi ppn ppp ppr ppt pra prc pre prg pri prn prp prr prt pt- pta ptc pte ptg pti ptn ptp ptr ptt ra- raa rac rae rag rai ran rap rar rat rca rcc rce rcg rci rcn rcp rcr rct re- rea rec ree reg rei ren rep rer ret rga rgc rge rgg rgi rgn rgp rgr rgt ria ric rie rig rii rin rip rir rit rna rnc rng rni rnn rnp rnr rnt rpa rpc rpe rpg rpi rpn rpp rpr rpt rra rrc rrg rri rrn rrp rrr rrt rta rtc rte rtg rti rtn rtp rtr rtt taa tac tae tag tai tan tap tar tat tca tcc tce tcg tci tcn tcp tcr tct te- tea tec tee teg tei ten tep ter tet tga tgc tge tgg tgi tgn tgp tgr tgt tia tic tie tig tii tin tip tir tit tna tnc tne tng tni tnn tnp tnr tnt tpa tpc tpe tpg tpi tpn tpp tpr tpt tra trc tre trg tri trn trp trr trt tta ttc tte ttg tti ttn ttp ttr ttt