a-a a-t aaa aan aas aat aax an- ana ann ans ant anx as- asa asn ass ast asx at- ata atn ats att atx ax- axa axn axs axt axx naa nan nas nat nax nna nnn nns nnt nsa nsn nss nst nsx nta ntn nts ntt ntx nxt saa san sas sat sax sna snn sns snt ss- ssa ssn sss sst ssx sta stn sts stt stx sxn sxs sxt t-x taa tan tas tat tax tna tnn tns tnt tnx tsa tsn tss tst tsx tta ttn tts ttt ttx txn txs txt xaa xan xas xat xna xns xsa xss xst xts xtx xxx