How to make key combination to do cool ability

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#1 
Currently_In_Ability = false
local UserInputService = game:GetService("UserInputService")
local Player = game.Players.LocalPlayer
local Character = Player.Character or Player.CharacterAdded:Wait()
local Humanoid = Character:WaitForChild("Humanoid")
local Anim = Instance.new("Animation")
Anim.AnimationId = "rbxassetid://9394210870"
local Anim = Humanoid:LoadAnimation(Anim)
local r_pressed = false
local t_pressed = false

UserInputService.InputBegan:Connect(function(input)
	if input.KeyCode == Enum.KeyCode.Z then 
		if Currently_In_Ability == false then
			Currently_In_Ability = true
			print("Inability")
			
			Anim:Play()
			
		else
			Anim:Stop()
			Currently_In_Ability = false
			print("Outability")
			
		end
	elseif Currently_In_Ability == true then
		--do the key combination
	end
end)

So, where it says "do combination, i wnat it so that they have to press R, then T, then T again, then T again, then R, then T, then G (R,T,T,T,R,T,G)once they are done pressing all those buttons in the exact order, then i want it to do something.

#2

So you need a buffer and then something to parse the buffer.
I was nice to code up a possible working way to do it

local buffer = {}
buffer.max = 15
buffer.keys = {} ::{Enum.KeyCode} --new to old
function buffer:clear()
	self:trimTo(0)
end
function buffer:trimTo(size :number?)
	size = size or self.max
	for k,v in pairs(self.keys) do
		if k > size then
			self.keys[k] = nil
		end
	end
end
function buffer:add(key :Enum.KeyCode)
	if key == Enum.KeyCode.Unknown then return end
	table.insert(self.keys, 1, key)
	self:trimTo()
end

type combo = {name :string, keys :string, action :()->()}
local combos :{combo} = {
	{
		name = "TestCombo";
		keys = "RFC";
		action = function()
			print("POW")
		end;
	};
}
for k,v in pairs(combos) do
	if not type(v) == "table" then continue end
	combos[k].keys = v.keys:upper()
end

function combos:findComboInBuffer() :combo?
	for k,combo in pairs(self) do
		if not type(combo) == "table" then continue end
		local tofind = combo.keys:reverse():split("")
		for pos,char in ipairs(tofind) do
			if buffer.keys[pos] ~= Enum.KeyCode[char] then return nil end
		end
		return combo
	end
end

game:GetService("UserInputService").InputBegan:Connect(function(input, gameProcessedEvent)
	if gameProcessedEvent then return end
	buffer:add(input.KeyCode)
	local foundCombo = combos:findComboInBuffer()
	if foundCombo then
		print("found combo",foundCombo.name)
		foundCombo:action()
		buffer:clear()
	end
end)
#3

Could you explain what a buffer is and how it is used in this example you provided?

#4

Essentially the buffer table is there to keep track of keypresses to be used as reference for when you use it in userinputservice

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