a-a a-c aaa aac aar aaw aax ac- aca acc acr acw acx ar- ara arc arr arw arx aw- awa awc awr aww ax- axa axr axx c-- caa cac car caw cax cca ccc ccr ccw ccx cra crc crr crw crx cw- cwa cwc cwr cxc cxr cxx ra- raa rac rar raw rax rca rcc rcr rcw rcx rra rrc rrr rwa rwc rwr rxr waa wac war waw wax wca wcc wcr wcw wcx wr- wra wrc wrr wrw wrx wwa wwc www wxc wxw xaa xac xar xcr xcx xrc xrx xwa xxx