Conditionals/Functions help please?

Hi, Been reading on the wiki a lot but still can't get this solved.

I have four different animations that I am trying to make play one after another via left click. I am able to get the first two animations to play correctly, however I can't get the last two animations to play.

animation.AnimationId = "rbxassetid://188046705" --BasicATK1


game.Players.LocalPlayer:GetMouse''.Button1Down:connect(function()

local character = Player.Character

animTrack = character:WaitForChild("Humanoid"):LoadAnimation(animation)

animTrack:Play()
wait(0.5)
animTrack:Stop()
wait(5)
return


end)

if animation.AnimationId ~= nil then

local animationSecond = Instance.new("Animation")

animationSecond.AnimationId = "rbxassetid://188253235" --BasicATK2

game.Players.LocalPlayer:GetMouse''.Button1Down:connect(function()

local character = Player.Character

animTrack = character:WaitForChild("Humanoid"):LoadAnimation(animationSecond)
animTrack:Play()
wait(0.1)
animTrack:Stop()
wait(5)

end)
end

if animation.AnimationId ~= nil then

local animationThird = Instance.new("Animation")

animationThird.AnimationId = "rbxassetid://188259240" --BasicATK3

game.Players.LocalPlayer:GetMouse''.Button1Down:connect(function()

local character = Player.Character

animTrack = character:WaitForChild("Humanoid"):LoadAnimationThird(animation)

animTrack:Play()
wait(0.1)
animTrack:Stop()
wait(5)

end)
end

if animation.AnimationId ~= nil then

local animationFourth = Instance.new("Animation")

animationFourth.AnimationId = "rbxassetid://188260074" --BasicATK4

game.Players.LocalPlayer:GetMouse''.Button1Down:connect(function()

local character = Player.Character

animTrack = character:WaitForChild("Humanoid"):LoadAnimation(animationFourth)

animTrack:Play()
wait(0.1)
animTrack:Stop()
wait(5)

end)
end