a-a a-c a-t aaa aac aaf aan aao aas aat ac- aca acc acf acn aco acs act af- afa afc aff afn afo afs aft an- ana anc anf ann ano ans ant aoa aoc aof aon aoo aos aot as- asa asc asf asn aso ass ast at- ata atc atf atn ato ats att c-- caa cac caf can cao cas cat cca ccc ccf ccn cco ccs cct cfa cfc cff cfn cfo cfs cft cn- cna cnc cnf cnn cno cns cnt co- coa coc cof con coo cos cot csa csc csf csn cso css cst cta ctc ctf ctn cto cts ctt faa fac faf fan fao fas fat fca fcc fcf fcn fco fcs fct ffa ffc fff ffn ffo ffs fft fna fnc fnf fnn fns fnt foa foc fof fon foo fos fot fsa fsc fsf fsn fso fss fst fta ftc ftf ftn fto fts ftt naa nac naf nan nao nas nat nca ncc ncf ncn nco ncs nct nfa nfc nff nfn nfo nfs nft nna nnc nnf nnn nno nns nnt no- noa noc nof non noo nos not nsa nsc nsf nsn nso nss nst nta ntc ntf ntn nto nts ntt oaa oac oaf oan oao oas oat oc- oca occ ocf ocn oco ocs oct of- ofa ofc off ofn ofo ofs oft on- ona onc onf onn ono ons ont oo- ooa ooc oof oon ooo oos oot os- osa osc osf osn oso oss ost ot- ota otc otf otn oto ots ott saa sac saf san sao sas sat sca scc scf scn sco scs sct sfa sfc sff sfn sfo sfs sft sna snc snf snn sno sns snt soa soc sof son soo sos sot ss- ssa ssc ssf ssn sso sss sst sta stc stf stn sto sts stt taa tac taf tan tao tas tat tca tcc tcf tcn tco tcs tct tfa tfc tff tfn tfo tfs tft tna tnc tnf tnn tno tns tnt to- toa toc tof ton too tos tot tsa tsc tsf tsn tso tss tst tta ttc ttf ttn tto tts ttt