a-a a-c a-t aaa aac aan aao aar aat aax ac- aca acc acn aco acr act acx an- ana anc ann ano anr ant anx aoa aoc aon aoo aor aot aox ar- ara arc arn aro arr art arx at- ata atc atn ato atr att atx ax- axa axn axo axr axt axx c-- caa cac can cao car cat cax cca ccc ccn cco ccr cct ccx cn- cna cnc cnn cno cnr cnt cnx co- coa coc con coo cor cot cox cra crc crn cro crr crt crx cta ctc ctn cto ctr ctt ctx cxc cxo cxr cxt cxx naa nac nan nao nar nat nax nca ncc ncn nco ncr nct ncx nna nnc nnn nno nnt no- noa noc non noo nor not nox nra nrc nrn nro nrr nrt nrx nta ntc ntn nto ntr ntt ntx nxc nxt oaa oac oan oao oar oat oax oc- oca occ ocn oco ocr oct ocx on- ona onc onn ono onr ont onx oo- ooa ooc oon ooo oor oot oox or- ora orc orn oro orr ort orx ot- ota otc otn oto otr ott ox- oxa oxc oxn oxo oxt oxx ra- raa rac ran rao rar rat rax rca rcc rcn rco rcr rct rcx rna rnc rnn rno rnr rnt roa roc ron roo ror rot rox rra rrc rrn rrr rrt rta rtc rtn rto rtr rtt rtx rxr t-x taa tac tan tao tar tat tax tca tcc tcn tco tcr tct tcx tna tnc tnn tno tnr tnt tnx to- toa toc ton too tor tot tox tra trc trn tro trr trt trx tta ttc ttn tto ttr ttt ttx txn txt xaa xac xan xar xat xcr xcx xna xnc xno xoa xoc xon xoo xor xot xox xrc xrt xrx xtc xtr xtx xxo xxx