a-a a-c a-t aaa aac aae aan aas aat ac- aca acc ace acn acs act aea aec aee aen aes aet an- ana anc ane ann ans ant as- asa asc ase asn ass ast at- ata atc ate atn ats att c-- caa cac cae can cas cat cca ccc cce ccn ccs cct ce- cea cec cee cen ces cet cn- cna cnc cne cnn cns cnt csa csc cse csn css cst cta ctc cte ctn cts ctt eaa eac eae ean eas eat ec- eca ecc ece ecn ecs ect eea eec eee een ees eet en- ena enc ene enn ens ent es- esa esc ese esn ess est eta etc ete etn ets ett naa nac nae nan nas nat nca ncc nce ncn ncs nct ne- nea nec nee nen nes net nna nnc nne nnn nns nnt nsa nsc nse nsn nss nst nta ntc nte ntn nts ntt saa sac sae san sas sat sca scc sce scn scs sct se- sea sec see sen ses set sna snc sne snn sns snt ss- ssa ssc sse ssn sss sst sta stc ste stn sts stt taa tac tae tan tas tat tca tcc tce tcn tcs tct te- tea tec tee ten tes tet tna tnc tne tnn tns tnt tsa tsc tse tsn tss tst tta ttc tte ttn tts ttt