a-a a-c a-t aaa aac aaf aan aao aap aas aat ac- aca acc acf acn aco acp acs act af- afa afc aff afn afo afp afs aft an- ana anc anf ann ano anp ans ant aoa aoc aof aon aoo aop aos aot ap- apa apc apf apn apo app aps apt as- asa asc asf asn aso asp ass ast at- ata atc atf atn ato atp ats att c-- caa cac caf can cao cap cas cat cca ccc ccf ccn cco ccp ccs cct cfa cfc cff cfn cfo cfp cfs cft cn- cna cnc cnf cnn cno cnp cns cnt co- coa coc cof con coo cop cos cot cpa cpc cpf cpn cpo cpp cps cpt csa csc csf csn cso csp css cst cta ctc ctf ctn cto ctp cts ctt faa fac faf fan fao fap fas fat fca fcc fcf fcn fco fcp fcs fct ffa ffc fff ffn ffo ffp ffs fft fna fnc fnf fnn fnp fns fnt foa foc fof fon foo fop fos fot fpa fpc fpn fpo fpp fps fpt fsa fsc fsf fsn fso fsp fss fst fta ftc ftf ftn fto ftp fts ftt naa nac naf nan nao nap nas nat nca ncc ncf ncn nco ncp ncs nct nfa nfc nff nfn nfo nfp nfs nft nna nnc nnf nnn nno nnp nns nnt no- noa noc nof non noo nop nos not npa npc npf npn npo npp nps npt nsa nsc nsf nsn nso nsp nss nst nta ntc ntf ntn nto ntp nts ntt oaa oac oaf oan oao oap oas oat oc- oca occ ocf ocn oco ocp ocs oct of- ofa ofc off ofn ofo ofp ofs oft on- ona onc onf onn ono onp ons ont oo- ooa ooc oof oon ooo oop oos oot op- opa opc opf opn opo opp ops opt os- osa osc osf osn oso osp oss ost ot- ota otc otf otn oto otp ots ott p-p paa pac paf pan pao pap pas pat pca pcc pcf pcn pco pcp pcs pct pfa pfc pff pfn pfo pfp pfs pft pn- pna pnc pnf pnn pno pnp pns pnt poa poc pof pon poo pop pos pot ppa ppc ppf ppn ppo ppp pps ppt ps- psa psc psf psn pso psp pss pst pt- pta ptc ptf ptn pto ptp pts ptt saa sac saf san sao sap sas sat sca scc scf scn sco scp scs sct sfa sfc sff sfn sfo sfp sfs sft sna snc snf snn sno snp sns snt soa soc sof son soo sop sos sot spa spc spf spn spo spp sps spt ss- ssa ssc ssf ssn sso ssp sss sst sta stc stf stn sto stp sts stt taa tac taf tan tao tap tas tat tca tcc tcf tcn tco tcp tcs tct tfa tfc tff tfn tfo tfp tfs tft tna tnc tnf tnn tno tnp tns tnt to- toa toc tof ton too top tos tot tpa tpc tpf tpn tpo tpp tps tpt tsa tsc tsf tsn tso tsp tss tst tta ttc ttf ttn tto ttp tts ttt