a-a a-c aaa aac aah aar aax ac- aca acc ach acr acx aha ahc ahh ahr ahx ar- ara arc arh arr arx ax- axa axh axr axx c-- caa cac cah car cax cca ccc cch ccr ccx ch- cha chc chh chr chx cra crc crh crr crx cxc cxh cxr cxx haa hac hah har hax hca hcc hch hcr hha hhc hhh hhr hr- hra hrc hrh hrr hxc ra- raa rac rah rar rax rca rcc rch rcr rcx rh- rha rhc rhh rhr rra rrc rrh rrr rxr xaa xac xar xch xcr xcx xrc xrx xxx