return function (roots, args)
    local R1 = {
        ["n"] = "I-n"
    }
    
    local R3 = {
    	["a"]    = "III",
    	["e"]    = "III-e",
        ["y"]    = "III",
        ["w"]    = "III",
    }

    if R3[roots[3]] then
        return R3[roots[3]]
	elseif R1[roots[1]] then 
        return R1[roots[1]]
	end
end