Generate a YGOPro Lua script for the following Yu-Gi-Oh card effect:
Special Summon 4 "Sheep Tokens" (Beast/EARTH/Level 1/ATK 0/DEF 0) in Defense Position. They cannot be Tributed for a Tribute Summon. You cannot Summon other monsters the turn you activate this card (but you can Normal Set).
--スケープ・ゴート
--Scapegoat
local s,id=GetID()
function s.initial_effect(c)
	--Special summon 4 tokens
	local e1=Effect.CreateEffect(c)
	e1:SetCategory(CATEGORY_SPECIAL_SUMMON+CATEGORY_TOKEN)
	e1:SetType(EFFECT_TYPE_ACTIVATE)
	e1:SetCode(EVENT_FREE_CHAIN)
	e1:SetHintTiming(0,TIMING_END_PHASE)
	e1:SetCost(s.cost)
	e1:SetTarget(s.target)
	e1:SetOperation(s.activate)
	c:RegisterEffect(e1)
end
s.listed_names={73915052}
function s.cost(e,tp,eg,ep,ev,re,r,rp,chk)
	if chk==0 then return Duel.GetActivityCount(tp,ACTIVITY_SUMMON)==0
		and Duel.GetActivityCount(tp,ACTIVITY_FLIPSUMMON)==0 and Duel.GetActivityCount(tp,ACTIVITY_SPSUMMON)==0 end
	local e1=Effect.CreateEffect(e:GetHandler())
	e1:SetType(EFFECT_TYPE_FIELD)
	e1:SetProperty(EFFECT_FLAG_PLAYER_TARGET+EFFECT_FLAG_OATH)
	e1:SetCode(EFFECT_CANNOT_SPECIAL_SUMMON)
	e1:SetReset(RESET_PHASE|PHASE_END)
	e1:SetTargetRange(1,0)
	e1:SetLabelObject(e)
	e1:SetTarget(s.sumlimit)
	Duel.RegisterEffect(e1,tp)
	local e2=Effect.CreateEffect(e:GetHandler())
	e2:SetType(EFFECT_TYPE_FIELD)
	e2:SetProperty(EFFECT_FLAG_PLAYER_TARGET+EFFECT_FLAG_OATH)
	e2:SetCode(EFFECT_CANNOT_SUMMON)
	e2:SetReset(RESET_PHASE|PHASE_END)
	e2:SetTargetRange(1,0)
	Duel.RegisterEffect(e2,tp)
	local e3=e2:Clone()
	e3:SetCode(EFFECT_CANNOT_FLIP_SUMMON)
	Duel.RegisterEffect(e3,tp)
	local e4=Effect.CreateEffect(e:GetHandler())
	e4:SetProperty(EFFECT_FLAG_PLAYER_TARGET+EFFECT_FLAG_CLIENT_HINT+EFFECT_FLAG_OATH)
	e4:SetDescription(aux.Stringid(id,1))
	e4:SetReset(RESET_PHASE|PHASE_END)
	e4:SetTargetRange(1,0)
	Duel.RegisterEffect(e4,tp)
end
function s.sumlimit(e,c,sump,sumtype,sumpos,targetp,se)
	return e:GetLabelObject()~=se
end
function s.target(e,tp,eg,ep,ev,re,r,rp,chk)
	if chk==0 then return not Duel.IsPlayerAffectedByEffect(tp,CARD_BLUEEYES_SPIRIT)
		and Duel.GetLocationCount(tp,LOCATION_MZONE)>3
		and Duel.IsPlayerCanSpecialSummonMonster(tp,id+1,0,TYPES_TOKEN,0,0,1,RACE_BEAST,ATTRIBUTE_EARTH) end
	Duel.SetOperationInfo(0,CATEGORY_TOKEN,nil,4,0,0)
	Duel.SetOperationInfo(0,CATEGORY_SPECIAL_SUMMON,nil,4,tp,0)
end
function s.activate(e,tp,eg,ep,ev,re,r,rp)
	if not Duel.IsPlayerAffectedByEffect(tp,CARD_BLUEEYES_SPIRIT) and Duel.GetLocationCount(tp,LOCATION_MZONE)>3
		and Duel.IsPlayerCanSpecialSummonMonster(tp,id+1,0,TYPES_TOKEN,0,0,1,RACE_BEAST,ATTRIBUTE_EARTH) then
		for i=1,4 do
			local token=Duel.CreateToken(tp,id+i)
			Duel.SpecialSummonStep(token,0,tp,tp,false,false,POS_FACEUP_DEFENSE)
			--Cannot be tributed for a tribute summon
			local e1=Effect.CreateEffect(e:GetHandler())
			e1:SetDescription(3304)
			e1:SetType(EFFECT_TYPE_SINGLE)
			e1:SetCode(EFFECT_UNRELEASABLE_SUM)
			e1:SetProperty(EFFECT_FLAG_CANNOT_DISABLE+EFFECT_FLAG_CLIENT_HINT)
			e1:SetValue(1)
			e1:SetReset(RESET_EVENT|RESETS_STANDARD)
			token:RegisterEffect(e1,true)
		end
		Duel.SpecialSummonComplete()
	end
end