a-a a-c aaa aac aam aar aax ac- aca acc acm acr acx ama amc amm amr amx ar- ara arc arm arr arx ax- axa axm axr axx c-- caa cac cam car cax cca ccc ccm ccr ccx cma cmc cmm cmr cmx cra crc crm crr crx cxc cxr cxx m-r maa mac mam mar max mc- mca mcc mcm mcr mcx mma mmc mmm mmr mmx mra mrc mrm mrr mrx mxa mxc mxr ra- raa rac ram rar rax rca rcc rcm rcr rcx rma rmc rmm rmr rmx rra rrc rrm rrr rxr xaa xac xam xar xcr xcx xma xmc xmm xmr xmx xrc xrx xxx