a-a a-t aaa aao aap aas aat aax aoa aoo aop aos aot aox ap- apa apo app aps apt apx as- asa aso asp ass ast asx at- ata ato atp ats att atx ax- axa axo axp axs axt axx oaa oao oap oas oat oax oo- ooa ooo oop oos oot oox op- opa opo opp ops opt opx os- osa oso osp oss ost osx ot- ota oto otp ots ott ox- oxa oxo oxt oxx p-p paa pao pap pas pat pax poa poo pop pos pot pox ppa ppo ppp pps ppt ppx ps- psa pso psp pss pst psx pt- pta pto ptp pts ptt ptx pxs pxt saa sao sap sas sat sax soa soo sop sos sot sox spa spo spp sps spt spx ss- ssa sso ssp sss sst ssx sta sto stp sts stt stx sxs sxt t-x taa tao tap tas tat tax to- toa too top tos tot tox tpa tpo tpp tps tpt tpx tsa tso tsp tss tst tsx tta tto ttp tts ttt ttx txs txt xaa xap xas xat xoa xoo xop xos xot xox xpa xpo xpp xps xpt xsa xsp xss xst xtp xts xtx xxo xxp xxx