a-a a-c a-t aaa aac aan aao aas aat ac- aca acc acn aco acs act an- ana anc ann ano ans ant aoa aoc aon aoo aos aot as- asa asc asn aso ass ast at- ata atc atn ato ats att c-- caa cac can cao cas cat cca ccc ccn cco ccs cct cn- cna cnc cnn cno cns cnt co- coa coc con coo cos cot csa csc csn cso css cst cta ctc ctn cto cts ctt naa nac nan nao nas nat nca ncc ncn nco ncs nct nna nnc nnn nno nns nnt no- noa noc non noo nos not nsa nsc nsn nso nss nst nta ntc ntn nto nts ntt oaa oac oan oao oas oat oc- oca occ ocn oco ocs oct on- ona onc onn ono ons ont oo- ooa ooc oon ooo oos oot os- osa osc osn oso oss ost ot- ota otc otn oto ots ott saa sac san sao sas sat sca scc scn sco scs sct sna snc snn sno sns snt soa soc son soo sos sot ss- ssa ssc ssn sso sss sst sta stc stn sto sts stt taa tac tan tao tas tat tca tcc tcn tco tcs tct tna tnc tnn tno tns tnt to- toa toc ton too tos tot tsa tsc tsn tso tss tst tta ttc ttn tto tts ttt