-er a-a a-c a-t aaa aac aae aag aan aao aap aar aat ac- aca acc ace acg acn aco acp acr act aea aec aee aeg aen aeo aep aer aet ag- aga agc age agg agn ago agp agr agt an- ana anc ane ang ann ano anp anr ant aoa aoc aoe aog aon aoo aop aor aot ap- apa apc ape apg apn apo app apr apt ar- ara arc are arg arn aro arp arr art at- ata atc ate atg atn ato atp atr att c-- caa cac cae cag can cao cap car cat cca ccc cce ccg ccn cco ccp ccr cct ce- cea cec cee ceg cen ceo cep cer cet cga cgc cge cgg cgn cgo cgp cgr cgt cn- cna cnc cne cng cnn cno cnp cnr cnt co- coa coc coe cog con coo cop cor cot cpa cpc cpe cpg cpn cpo cpp cpr cpt cra crc cre crg crn cro crp crr crt cta ctc cte ctg ctn cto ctp ctr ctt eaa eac eae eag ean eao eap ear eat ec- eca ecc ece ecg ecn eco ecr ect eea eec eee eeg een eeo eep eer eet ega egc ege egg egn ego egp egr egt en- ena enc ene eng enn eno enp enr ent eo- eoa eoc eoe eog eon eoo eop eor eot ep- epa epc epe epg epn epo epp epr ept era erc ere erg ern ero erp err ert eta etc ete etg etn eto etp etr ett g-p gaa gac gae gag gan gao gap gar gat gca gcc gce gcg gcn gco gcp gcr gct ge- gea gec gee geg gen geo gep ger get gga ggc ggg ggn ggo ggp ggr ggt gna gnc gne gnn gno gnp gnr gnt goa goc goe gog gon goo gop gor got gpa gpc gpe gpg gpn gpo gpp gpr gpt gra grc gre grg grn gro grp grr grt gta gtc gte gtg gtn gto gtp gtr gtt naa nac nae nag nan nao nap nar nat nca ncc nce ncg ncn nco ncp ncr nct ne- nea nec nee neg nen neo nep ner net nga ngc nge ngg ngn ngo ngp ngt nna nnc nne nng nnn nno nnp nnt no- noa noc noe nog non noo nop nor not npa npc npe npg npn npo npp npr npt nra nrc nre nrg nrn nro nrp nrr nrt nta ntc nte ntg ntn nto ntp ntr ntt oaa oac oae oag oan oao oap oar oat oc- oca occ ocg ocn oco ocp ocr oct oea oec oee oeg oen oeo oep oer oet oga ogc oge ogg ogn ogo ogp ogt on- ona onc one ong onn ono onp onr ont oo- ooa ooc oog oon ooo oop oor oot op- opa opc ope opg opn opo opp opr opt or- ora orc ore org orn oro orp orr ort ot- ota otc ote otg otn oto otp otr ott p-p paa pac pae pag pan pao pap par pat pca pcc pce pcg pcn pco pcp pcr pct pea pec pee peg pen peo pep per pet pga pgc pge pgg pgn pgo pgp pgr pgt pn- pna pnc pne png pnn pno pnp pnr pnt poa poc poe pog pon poo pop por pot ppa ppc ppe ppg ppn ppo ppp ppr ppt pra prc pre prg prn pro prp prr prt pt- pta ptc pte ptg ptn pto ptp ptr ptt ra- raa rac rae rag ran rao rap rar rat rca rcc rce rcg rcn rco rcp rcr rct re- rea rec ree reg ren reo rep rer ret rga rgc rge rgg rgn rgo rgp rgr rgt rna rnc rng rnn rno rnp rnr rnt roa roc roe rog ron roo rop ror rot rpa rpc rpe rpg rpn rpo rpp rpr rpt rra rrc rrg rrn rrp rrr rrt rta rtc rte rtg rtn rto rtp rtr rtt taa tac tae tag tan tao tap tar tat tca tcc tce tcg tcn tco tcp tcr tct te- tea tec tee teg ten teo tep ter tet tga tgc tge tgg tgn tgo tgp tgr tgt tna tnc tne tng tnn tno tnp tnr tnt to- toa toc toe tog ton too top tor tot tpa tpc tpe tpg tpn tpo tpp tpr tpt tra trc tre trg trn tro trp trr trt tta ttc tte ttg ttn tto ttp ttr ttt