Generate a YGOPro Lua script for the following Yu-Gi-Oh card effect:
Target up to 2 "Crystal Beast" monsters in your GY; place those targets face-up in your Spell & Trap Zone as Continuous Spells.
--宝玉の恵み
--Crystal Blessing
local s,id=GetID()
function s.initial_effect(c)
	--Activate
	local e1=Effect.CreateEffect(c)
	e1:SetCategory(CATEGORY_LEAVE_GRAVE)
	e1:SetProperty(EFFECT_FLAG_CARD_TARGET)
	e1:SetType(EFFECT_TYPE_ACTIVATE)
	e1:SetCode(EVENT_FREE_CHAIN)
	e1:SetTarget(s.target)
	e1:SetOperation(s.activate)
	c:RegisterEffect(e1)
end
s.listed_series={SET_CRYSTAL_BEAST}
function s.filter(c)
	return c:IsSetCard(SET_CRYSTAL_BEAST) and not c:IsForbidden()
end
function s.target(e,tp,eg,ep,ev,re,r,rp,chk,chkc)
	if chkc then return chkc:IsControler(tp) and chkc:IsLocation(LOCATION_GRAVE) and s.filter(chkc) end
	if chk==0 then
		if not Duel.IsExistingTarget(s.filter,tp,LOCATION_GRAVE,0,1,nil) then return false end
		if e:GetHandler():IsLocation(LOCATION_HAND) then
			return Duel.GetLocationCount(tp,LOCATION_SZONE)>1
		else return Duel.GetLocationCount(tp,LOCATION_SZONE)>0 end
	end
	local ft=Duel.GetLocationCount(tp,LOCATION_SZONE)
	if ft>2 then ft=2 end
	Duel.Hint(HINT_SELECTMSG,tp,HINTMSG_TOFIELD)
	local g=Duel.SelectTarget(tp,s.filter,tp,LOCATION_GRAVE,0,1,ft,nil)
	Duel.SetOperationInfo(0,CATEGORY_LEAVE_GRAVE,g,#g,0,0)
end
function s.activate(e,tp,eg,ep,ev,re,r,rp)
	local ft=Duel.GetLocationCount(tp,LOCATION_SZONE)
	if ft<=0 then return end
	local g=Duel.GetChainInfo(0,CHAININFO_TARGET_CARDS)
	local sg=g:Filter(Card.IsRelateToEffect,nil,e)
	if #sg>0 then
		if #sg>ft then
			Duel.Hint(HINT_SELECTMSG,tp,HINTMSG_TOFIELD)
			local rg=sg:Select(tp,ft,ft,nil)
			sg=rg
		end
		local tc=sg:GetFirst()
		for tc in aux.Next(sg) do
			Duel.MoveToField(tc,tp,tp,LOCATION_SZONE,POS_FACEUP,true)
			local e1=Effect.CreateEffect(e:GetHandler())
			e1:SetCode(EFFECT_CHANGE_TYPE)
			e1:SetType(EFFECT_TYPE_SINGLE)
			e1:SetProperty(EFFECT_FLAG_CANNOT_DISABLE)
			e1:SetReset(RESET_EVENT|RESETS_STANDARD&~RESET_TURN_SET)
			e1:SetValue(TYPE_SPELL+TYPE_CONTINUOUS)
			tc:RegisterEffect(e1)
		end
		Duel.RaiseEvent(sg,EVENT_CUSTOM+CARD_CRYSTAL_TREE,e,0,tp,0,0)
	end
end