a-ii aaaa aaac aaaf aaai aaca aacc aacf aaci aafa aafc aaff aafi aaic aaii acaa acac acai acca accc accf acci acfc acfi aci- acia acic acif afaa afca afcc afci affa affc affi afia afif aiai aica aicc aicf aiff aiia aiic caaa caac caaf cac- caca cacc caci cafa cafc caff caia caic ccaa ccac ccaf ccai ccca cccc cccf ccci ccfa ccfc ccff ccfi ccic ccii cfaa cfac cfca cfcf cfia ciaa cica cicc cici cifa ciff ciia ciii faaa faac faca facc fafa fafc faff fafi fcca fccf fcic fcii ffcc ffff ffii fiaa fiac fiaf fica ficc fifa fifc fiff fifi fiii iaaa iaac iaai iaca iacc iaff iaia icaa icac icaf icai icca iccc iccf icci ifaa ifac ific iiac iica iifa iiii