"make a roblox script where if Harlandroblox says !game3 then my Part called mmb will come out of ReplicatedStorage at position -151.893, 0.5, -16.464 and then it will more backwards at a speed of 20 for 20 seconds then it will disappear use tween service but there is also Another Part called mtt what does the same thing but Starts at position -71.388, 8.215, -149.406 and goes forward"

```lua
-- server script
local Players = game:GetService("Players")
local TweenService = game:GetService("TweenService")
local ReplicatedStorage = game:GetService("ReplicatedStorage")

local mmb = ReplicatedStorage:WaitForChild("mmb")
local mtt = ReplicatedStorage:WaitForChild("mtt")

local function movePart(part, startPosition, endPosition, duration)
    local tweenInfo = TweenInfo.new(duration, Enum.EasingStyle.Linear, Enum.EasingDirection.Out)
    local tween = TweenService:Create(part, tweenInfo, {Position = endPosition})
    part.Position = startPosition
    part.Parent = workspace
    tween:Play()
    tween.Completed:Wait()
    part.Parent = ReplicatedStorage
end

local function onPlayerChatted(player, message)
    if message == "!game3" and player.Name == "Harlandroblox" then
        local mmbClone = mmb:Clone()
        local mttClone = mtt:Clone()

movePart(mmbClone, Vector3.new(-151.893, 0.5, -16.464), Vector3.new(-151.893, 0.5, -16.464) - Vector3.new(0, 0, 20), 20)
        movePart(mttClone, Vector3.new(-71.388, 8.215, -149.406), Vector3.new(-71.388, 8.215, -149.406) + Vector3.new(0, 0, 20), 20)
    end
end

Players.PlayerAdded:Connect(function(player)
    player.Chatted:Connect(function(message)
        onPlayerChatted(player, message)
    end)
end)
```
Make sure you have two parts named "mmb" and "mtt" in the ReplicatedStorage. This script will listen for the player "Harlandroblox" to say "!game3" in the chat, and when they do, it will move the parts "mmb" and "mtt" according to the specified positions and directions.