-er a-a a-c aaa aac aae aag aah aak aan aar ac- aca acc ace acg ach ack acn acr aea aec aee aeg aeh aek aen aer ag- aga agc age agg agh agk agn agr aha ahc ahe ahg ahh ahk ahn ahr aka akc ake akg akh akk akn akr an- ana anc ane ang anh ank ann anr ar- ara arc are arg arh ark arn arr c-- caa cac cae cag cah cak can car cca ccc cce ccg cch cck ccn ccr ce- cea cec cee ceg ceh cek cen cer cga cgc cge cgg cgh cgn cgr ch- cha chc che chg chh chk chn chr cka ckc ckh cn- cna cnc cne cng cnh cnn cnr cra crc cre crg crh crk crn crr eaa eac eae eag eah eak ean ear ec- eca ecc ece ecg ech eck ecn ecr eea eec eee eeg eek een eer ega egc ege egg egh egn egr eha ehc ehe ehg ehh ehn ehr eka ekc eke ekg ekh ekr en- ena enc ene eng enh enk enn enr era erc ere erg erh erk ern err gaa gac gae gag gah gak gan gar gca gcc gce gcg gch gck gcn gcr ge- gea gec gee geg geh gek gen ger gga ggc ggg ggh ggn ggr gha ghc ghe ghg ghh ghn ghr gka gkh gkn gna gnc gne gnn gnr gra grc gre grg grh grk grn grr haa hac hae hag hah hak han har hca hcc hce hcg hch hck hcn hcr he- hea hec hee heg heh hek hen her hga hgc hge hgg hgh hgk hgn hgr hha hhc hhe hhg hhh hhk hhn hhr hka hkg hkh hkk hkn hkr hna hnc hne hng hnh hnk hnn hr- hra hrc hre hrg hrh hrk hrn hrr ka- kaa kac kae kag kah kak kan kar kca kcc kce kcg kch kck kcn kcr ke- kea kec kee keg keh kek ken ker kga kgc kgh kha khe khh khk khn khr kkc kke kkh kkk kkn kkr kn- kna knc kne kng knk knn knr kra krc krg krk krn krr naa nac nae nag nah nak nan nar nca ncc nce ncg nch nck ncn ncr ne- nea nec nee neg neh nek nen ner nga ngc nge ngg ngh ngk ngn nha nhc nhe nhg nhh nhk nhn nhr nka nkc nke nkk nkn nkr nna nnc nne nng nnh nnk nnn nra nrc nre nrg nrk nrn nrr ra- raa rac rae rag rah rak ran rar rca rcc rce rcg rch rcn rcr re- rea rec ree reg reh rek ren rer rga rgc rge rgg rgh rgk rgn rgr rh- rha rhc rhe rhg rhh rhn rhr rkc rke rkg rkk rna rnc rng rnh rnn rnr rra rrc rrg rrh rrk rrn rrr