So I thought ths 2 lines (not buttons[v]) and buttons[v] = v will stop v from getting inserted to buttons twice, but no it still does.

local buttons = { }
local num = 0


for _, v in pairs (script.Parent:GetDescendants())do
    if v:IsA("TextButton") and (not buttons[v])and v.Name == "l" or v.Name == "o" thn
        v.MouseButton1Click:Connect(function()

            buttons[v] = v
            print(buttons[v])

            v.TextColor3 = Color3.fromRGB(0,255,0)


            num = num + 1
            print(num)
            if  num == 8 then
                print("bloxycola")
            end     
        end)

    end
end

How to prevent this from happening?