Generate a YGOPro Lua script for the following Yu-Gi-Oh card effect:
If you have exactly 3 Normal Monsters in your Graveyard, you can Special Summon this card from your hand by removing from play 2 Normal Monsters from your Graveyard. Once per turn, you can select and Special Summon 1 Level 4 or lower Normal Monster from your Graveyard.
--紅蓮魔闘士
--Knight of the Red Lotus
local s,id=GetID()
function s.initial_effect(c)
	--special summon
	local e1=Effect.CreateEffect(c)
	e1:SetType(EFFECT_TYPE_FIELD)
	e1:SetCode(EFFECT_SPSUMMON_PROC)
	e1:SetProperty(EFFECT_FLAG_UNCOPYABLE)
	e1:SetRange(LOCATION_HAND)
	e1:SetCondition(s.spcon)
	e1:SetTarget(s.sptg)
	e1:SetOperation(s.spop)
	c:RegisterEffect(e1)
	--SpecialSummon
	local e2=Effect.CreateEffect(c)
	e2:SetDescription(aux.Stringid(id,0))
	e2:SetCategory(CATEGORY_SPECIAL_SUMMON)
	e2:SetType(EFFECT_TYPE_IGNITION)
	e2:SetCountLimit(1)
	e2:SetProperty(EFFECT_FLAG_CARD_TARGET)
	e2:SetRange(LOCATION_MZONE)
	e2:SetTarget(s.target)
	e2:SetOperation(s.operation)
	c:RegisterEffect(e2)
end
function s.spcfilter(c)
	return c:IsType(TYPE_NORMAL) and c:IsAbleToRemoveAsCost() and aux.SpElimFilter(c,true)
end
function s.spcon(e,c)
	if c==nil then return true end
	local tp=c:GetControler()
	local rg=Duel.GetMatchingGroup(s.spcfilter,tp,LOCATION_MZONE|LOCATION_GRAVE,0,nil)
	return Duel.GetLocationCount(tp,LOCATION_MZONE)>-2 and #rg>1 
		and Duel.GetMatchingGroupCount(Card.IsType,c:GetControler(),LOCATION_GRAVE,0,nil,TYPE_NORMAL)==3 
		and aux.SelectUnselectGroup(rg,e,tp,2,2,aux.ChkfMMZ(1),0)
end
function s.sptg(e,tp,eg,ep,ev,re,r,rp,c)
	local rg=Duel.GetMatchingGroup(s.spcfilter,tp,LOCATION_MZONE|LOCATION_GRAVE,0,nil)
	local g=aux.SelectUnselectGroup(rg,e,tp,2,2,aux.ChkfMMZ(1),1,tp,HINTMSG_REMOVE,nil,nil,true)
		if #g>0 then
		g:KeepAlive()
		e:SetLabelObject(g)
		return true
	end
	return false
end
function s.spop(e,tp,eg,ep,ev,re,r,rp,c)
	local g=e:GetLabelObject()
	if not g then return end
	Duel.Remove(g,POS_FACEUP,REASON_COST)
	g:DeleteGroup()
end
function s.tgfilter(c,e,tp)
	return c:IsType(TYPE_NORMAL) and c:IsLevelBelow(4) and c:IsCanBeSpecialSummoned(e,0,tp,false,false)
end
function s.target(e,tp,eg,ep,ev,re,r,rp,chk,chkc)
	if chkc then return chkc:IsLocation(LOCATION_GRAVE) and chkc:IsControler(tp) and s.tgfilter(chkc,e,tp) end
	if chk==0 then return Duel.GetLocationCount(tp,LOCATION_MZONE)>0
		and Duel.IsExistingTarget(s.tgfilter,tp,LOCATION_GRAVE,0,1,nil,e,tp) end
	Duel.Hint(HINT_SELECTMSG,tp,HINTMSG_SPSUMMON)
	local g=Duel.SelectTarget(tp,s.tgfilter,tp,LOCATION_GRAVE,0,1,1,nil,e,tp)
	Duel.SetOperationInfo(0,CATEGORY_SPECIAL_SUMMON,g,1,0,0)
end
function s.operation(e,tp,eg,ep,ev,re,r,rp)
	if Duel.GetLocationCount(tp,LOCATION_MZONE)<=0 then return end
	local tc=Duel.GetFirstTarget()
	if tc and tc:IsRelateToEffect(e) then
		Duel.SpecialSummon(tc,0,tp,tp,false,false,POS_FACEUP)
	end
end