a-a a-c a-t aaa aac aaf aao aar aat aax ac- aca acc acf aco acr act acx af- afa afc aff afo afr aft afx aoa aoc aof aoo aor aot aox ar- ara arc arf aro arr art arx at- ata atc atf ato atr att atx ax- axa axo axr axt axx c-- caa cac caf cao car cat cax cca ccc ccf cco ccr cct ccx cfa cfc cff cfo cfr cft cfx co- coa coc cof coo cor cot cox cra crc crf cro crr crt crx cta ctc ctf cto ctr ctt ctx cxc cxf cxo cxr cxt cxx faa fac faf fao far fat fax fca fcc fcf fco fcr fct fcx ffa ffc fff ffo ffr fft ffx foa foc fof foo for fot fox fra frc frf fro frr frt fta ftc ftf fto ftr ftt ftx fxr fxt fxx oaa oac oaf oao oar oat oax oc- oca occ ocf oco ocr oct ocx of- ofa ofc off ofo ofr oft ofx oo- ooa ooc oof ooo oor oot oox or- ora orc orf oro orr ort orx ot- ota otc otf oto otr ott ox- oxa oxc oxf oxo oxt oxx ra- raa rac raf rao rar rat rax rca rcc rcf rco rcr rct rcx rfa rfc rff rfo rfr rft roa roc rof roo ror rot rox rra rrc rrf rrr rrt rta rtc rtf rto rtr rtt rtx rxr t-x taa tac taf tao tar tat tax tca tcc tcf tco tcr tct tcx tfa tfc tff tfo tfr tft tfx to- toa toc tof too tor tot tox tra trc trf tro trr trt trx tta ttc ttf tto ttr ttt ttx txf txt xaa xac xaf xar xat xcf xcr xcx xfa xft xfx xoa xoc xof xoo xor xot xox xrc xrf xrt xrx xtc xtf xtr xtx xxo xxx