Generate a YGOPro Lua script for the following Yu-Gi-Oh card effect:
Return 1 Tuner Synchro Monster and 1 non-Tuner Synchro Monster you control to the Extra Deck; Special Summon 1 Synchro Monster from your Extra Deck that has a Level equal to the combined Levels the 2 monsters had on the field, ignoring its Summoning conditions. You can only activate 1 "Limit Overdrive" per turn.
--リミットオーバー・ドライブ
--Limit Overdrive
local s,id=GetID()
function s.initial_effect(c)
	--Activate
	local e1=Effect.CreateEffect(c)
	e1:SetCategory(CATEGORY_SPECIAL_SUMMON)
	e1:SetType(EFFECT_TYPE_ACTIVATE)
	e1:SetCode(EVENT_FREE_CHAIN)
	e1:SetCountLimit(1,id,EFFECT_COUNT_CODE_OATH)
	e1:SetCost(s.cost)
	e1:SetTarget(s.target)
	e1:SetOperation(s.activate)
	c:RegisterEffect(e1)
end
function s.cfilter1(c,e,tp)
	return c:IsFaceup() and c:IsType(TYPE_SYNCHRO) and c:IsType(TYPE_TUNER) and c:IsAbleToExtraAsCost()
		and Duel.IsExistingMatchingCard(s.cfilter2,tp,LOCATION_MZONE,0,1,nil,e,tp,c)
end
function s.cfilter2(c,e,tp,tc)
	return c:IsFaceup() and c:IsType(TYPE_SYNCHRO) and not c:IsType(TYPE_TUNER) and c:IsAbleToExtraAsCost()
		and Duel.IsExistingMatchingCard(s.spfilter,tp,LOCATION_EXTRA,0,1,nil,e,tp,c:GetLevel()+tc:GetLevel(),Group.FromCards(c,tc))
end
function s.spfilter(c,e,tp,lv,mg)
	return c:IsType(TYPE_SYNCHRO) and c:GetLevel()==lv and Duel.GetLocationCountFromEx(tp,tp,mg,c)>0 and c:IsCanBeSpecialSummoned(e,0,tp,true,false)
end
function s.cost(e,tp,eg,ep,ev,re,r,rp,chk)
	e:SetLabel(1)
	if chk==0 then return Duel.IsExistingMatchingCard(s.cfilter1,tp,LOCATION_MZONE,0,1,nil,e,tp) end
	Duel.Hint(HINT_SELECTMSG,tp,HINTMSG_TODECK)
	local g1=Duel.SelectMatchingCard(tp,s.cfilter1,tp,LOCATION_MZONE,0,1,1,nil,e,tp)
	Duel.Hint(HINT_SELECTMSG,tp,HINTMSG_TODECK)
	local g2=Duel.SelectMatchingCard(tp,s.cfilter2,tp,LOCATION_MZONE,0,1,1,nil,e,tp,g1:GetFirst())
	e:SetLabel(g1:GetFirst():GetLevel()+g2:GetFirst():GetLevel())
	g1:Merge(g2)
	Duel.SendtoDeck(g1,nil,SEQ_DECKTOP,REASON_COST)
end
function s.target(e,tp,eg,ep,ev,re,r,rp,chk)
	if chk==0 then
		if e:GetLabel()~=1 then return false end
		e:SetLabel(0)
		return true
	end
	Duel.SetOperationInfo(0,CATEGORY_SPECIAL_SUMMON,nil,1,tp,LOCATION_EXTRA)
end
function s.activate(e,tp,eg,ep,ev,re,r,rp)
	local lv=e:GetLabel()
	Duel.Hint(HINT_SELECTMSG,tp,HINTMSG_SPSUMMON)
	local g=Duel.SelectMatchingCard(tp,s.spfilter,tp,LOCATION_EXTRA,0,1,1,nil,e,tp,lv)
	if #g>0 then
		Duel.SpecialSummon(g,0,tp,tp,true,false,POS_FACEUP)
	end
end