-ic a-a a-c a-i aaa aac aai aar aas aax ac- aca acc aci acr acs acx ai- aia aic aii air ais aix ar- ara arc ari arr ars arx as- asa asc asi asr ass asx ax- axa axi axr axs axx c-- caa cac cai car cas cax cca ccc cci ccr ccs ccx ci- cia cic cii cir cis cix cra crc cri crr crs crx csa csc csi csr css csx cxc cxi cxr cxs cxx ia- iaa iac iai iar ias ica icc ici icr ics iia iic iii iir iis iix ir- ira irc iri irr irs irx is- isa isc isi isr iss ixc ixi ra- raa rac rai rar ras rax rca rcc rci rcr rcs rcx ria ric rii rir ris rix rra rrc rri rrr rrs rsa rsc rsi rsr rss rsx rxr rxs saa sac sai sar sas sax sca scc sci scr scs scx sia sic sii sir sis six sr- sra src sri srr srs srx ss- ssa ssc ssi ssr sss ssx sxc sxi sxs xaa xac xar xas xci xcr xcx xia xic xii xis xix xrc xrx xsa xsc xsi xss xxi xxx