Generate a YGOPro Lua script for the following Yu-Gi-Oh card effect:
FLIP: Special Summon 3 "Chewbone Jr. Tokens" (Zombie-Type/EARTH/Level 1/ATK 100/DEF 300) to your opponent's field in Defense Position.
--チュウボーン
--Chewbone
local s,id=GetID()
function s.initial_effect(c)
	--flip
	local e1=Effect.CreateEffect(c)
	e1:SetDescription(aux.Stringid(id,0))
	e1:SetCategory(CATEGORY_SPECIAL_SUMMON+CATEGORY_TOKEN)
	e1:SetType(EFFECT_TYPE_SINGLE+EFFECT_TYPE_FLIP)
	e1:SetTarget(s.target)
	e1:SetOperation(s.operation)
	c:RegisterEffect(e1)
end
s.listed_names={7392746}
function s.target(e,tp,eg,ep,ev,re,r,rp,chk)
	if chk==0 then return true end
	Duel.SetOperationInfo(0,CATEGORY_TOKEN,nil,3,0,0)
	Duel.SetOperationInfo(0,CATEGORY_SPECIAL_SUMMON,nil,3,tp,0)
end
function s.operation(e,tp,eg,ep,ev,re,r,rp)
	if Duel.IsPlayerAffectedByEffect(tp,CARD_BLUEEYES_SPIRIT) or Duel.GetLocationCount(1-tp,LOCATION_MZONE)<3 
		or not Duel.IsPlayerCanSpecialSummonMonster(tp,id+1,0,TYPES_TOKEN,100,300,1,RACE_ZOMBIE,ATTRIBUTE_EARTH,POS_FACEUP_DEFENSE,1-tp) then return end
	for i=1,3 do
		local token=Duel.CreateToken(tp,id+1)
		Duel.SpecialSummonStep(token,0,tp,1-tp,false,false,POS_FACEUP_DEFENSE)
	end
	Duel.SpecialSummonComplete()
end