a-a a-t aaa aan aao aas aat aax an- ana ann ano ans ant anx aoa aon aoo aos aot aox as- asa asn aso ass ast asx at- ata atn ato ats att atx ax- axa axn axo axs axt axx naa nan nao nas nat nax nna nnn nno nns nnt no- noa non noo nos not nox nsa nsn nso nss nst nsx nta ntn nto nts ntt ntx nxt oaa oan oao oas oat oax on- ona onn ono ons ont onx oo- ooa oon ooo oos oot oox os- osa osn oso oss ost osx ot- ota otn oto ots ott ox- oxa oxn oxo oxt oxx saa san sao sas sat sax sna snn sno sns snt soa son soo sos sot sox ss- ssa ssn sso sss sst ssx sta stn sto sts stt stx sxn sxs sxt t-x taa tan tao tas tat tax tna tnn tno tns tnt tnx to- toa ton too tos tot tox tsa tsn tso tss tst tsx tta ttn tto tts ttt ttx txn txs txt xaa xan xas xat xna xno xns xoa xon xoo xos xot xox xsa xss xst xts xtx xxo xxx