a-a a-c aaa aac aar aau aax ac- aca acc acr acu acx ar- ara arc arr aru arx au- aua auc aur aux ax- axa axr axx c-- caa cac car cau cax cca ccc ccr ccu ccx cra crc crr cru crx cua cuc cur cuu cxc cxr cxx ra- raa rac rar rau rax rca rcc rcr rcu rcx rra rrc rrr rru rua ruc rur ruu rux rxr ua- uaa uac uar uau uca ucc ucr ucu ur- ura urc urr uru urx uua uuc uur uuu uxc uxr uxu xaa xac xar xau xcr xcx xrc xrx xxx