a-a a-c a-t aaa aac aaf aao aap aas aat aax ac- aca acc acf aco acp acs act acx af- afa afc aff afo afp afs aft afx aoa aoc aof aoo aop aos aot aox ap- apa apc apf apo app aps apt apx as- asa asc asf aso asp ass ast asx at- ata atc atf ato atp ats att atx ax- axa axo axp axs axt axx c-- caa cac caf cao cap cas cat cax cca ccc ccf cco ccp ccs cct ccx cfa cfc cff cfo cfp cfs cft cfx co- coa coc cof coo cop cos cot cox cpa cpc cpf cpo cpp cps cpt cpx csa csc csf cso csp css cst csx cta ctc ctf cto ctp cts ctt ctx cxc cxf cxo cxp cxs cxt cxx faa fac faf fao fap fas fat fax fca fcc fcf fco fcp fcs fct fcx ffa ffc fff ffo ffp ffs fft ffx foa foc fof foo fop fos fot fox fpa fpc fpo fpp fps fpt fpx fsa fsc fsf fso fsp fss fst fsx fta ftc ftf fto ftp fts ftt ftx fxp fxs fxt fxx oaa oac oaf oao oap oas oat oax oc- oca occ ocf oco ocp ocs oct ocx of- ofa ofc off ofo ofp ofs oft ofx oo- ooa ooc oof ooo oop oos oot oox op- opa opc opf opo opp ops opt opx os- osa osc osf oso osp oss ost osx ot- ota otc otf oto otp ots ott ox- oxa oxc oxf oxo oxt oxx p-p paa pac paf pao pap pas pat pax pca pcc pcf pco pcp pcs pct pcx pfa pfc pff pfo pfp pfs pft pfx poa poc pof poo pop pos pot pox ppa ppc ppf ppo ppp pps ppt ppx ps- psa psc psf pso psp pss pst psx pt- pta ptc ptf pto ptp pts ptt ptx pxc pxs pxt saa sac saf sao sap sas sat sax sca scc scf sco scp scs sct scx sfa sfc sff sfo sfp sfs sft sfx soa soc sof soo sop sos sot sox spa spc spf spo spp sps spt spx ss- ssa ssc ssf sso ssp sss sst ssx sta stc stf sto stp sts stt stx sxc sxs sxt t-x taa tac taf tao tap tas tat tax tca tcc tcf tco tcp tcs tct tcx tfa tfc tff tfo tfp tfs tft tfx to- toa toc tof too top tos tot tox tpa tpc tpf tpo tpp tps tpt tpx tsa tsc tsf tso tsp tss tst tsx tta ttc ttf tto ttp tts ttt ttx txf txs txt xaa xac xaf xap xas xat xcf xcp xcx xfa xfs xft xfx xoa xoc xof xoo xop xos xot xox xpa xpc xpf xpo xpp xps xpt xsa xsc xsp xss xst xtc xtf xtp xts xtx xxo xxp xxx