a-a aaa aan aar aas aax an- ana ann anr ans anx ar- ara arn arr ars arx as- asa asn asr ass asx ax- axa axn axr axs axx naa nan nar nas nax nna nnn nns nra nrn nrr nrs nrx nsa nsn nsr nss nsx ra- raa ran rar ras rax rna rnn rnr rns rra rrn rrr rrs rsa rsn rsr rss rsx rxr rxs saa san sar sas sax sna snn snr sns sr- sra srn srr srs srx ss- ssa ssn ssr sss ssx sxn sxs xaa xan xar xas xna xns xrx xsa xss xxx