Selection by share blance

function createSpawnSequence(inputBalance)
    local outputString = ""
    local totalSpawns = 0
    for kind, count in pairs(inputBalance) do
        totalSpawns = totalSpawns + count
    end
    for i = totalSpawns, 1, -1 do
        i = math.random(i)
        for kind, count in pairs(inputBalance) do
            if i <= count then
                outputString = outputString .. "," .. kind
                inputBalance[kind] = count - 1
                break
            else
                i = i - count
            end
        end
    end
    return string.sub(outputString, 2)
end