Generate a YGOPro Lua script for the following Yu-Gi-Oh card effect:
When this face-up card on the field is destroyed and sent to the Graveyard, you can select 2 "Genex" monsters from your Graveyard, and return them to the Deck.
--レアル・ジェネクス・ウルティマム
--R-Genex Ultimum
local s,id=GetID()
function s.initial_effect(c)
	--special summon
	local e1=Effect.CreateEffect(c)
	e1:SetDescription(aux.Stringid(id,0))
	e1:SetCategory(CATEGORY_TODECK)
	e1:SetProperty(EFFECT_FLAG_CARD_TARGET+EFFECT_FLAG_DAMAGE_STEP)
	e1:SetType(EFFECT_TYPE_SINGLE+EFFECT_TYPE_TRIGGER_O)
	e1:SetCode(EVENT_TO_GRAVE)
	e1:SetCondition(s.condition)
	e1:SetTarget(s.target)
	e1:SetOperation(s.operation)
	c:RegisterEffect(e1)
end
s.listed_series={SET_GENEX}
function s.condition(e,tp,eg,ep,ev,re,r,rp)
	local c=e:GetHandler()
	return c:IsPreviousLocation(LOCATION_ONFIELD) and c:IsReason(REASON_DESTROY) and c:IsPreviousPosition(POS_FACEUP)
end
function s.filter(c)
	return c:IsSetCard(SET_GENEX) and c:IsAbleToDeck()
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.filter(chkc) end
	if chk==0 then return Duel.IsExistingTarget(s.filter,tp,LOCATION_GRAVE,0,2,nil) end
	Duel.Hint(HINT_SELECTMSG,tp,HINTMSG_TODECK)
	local g=Duel.SelectTarget(tp,s.filter,tp,LOCATION_GRAVE,0,2,2,nil)
	Duel.SetOperationInfo(0,CATEGORY_TODECK,g,2,0,0)
end
function s.operation(e,tp,eg,ep,ev,re,r,rp)
	local g=Duel.GetChainInfo(0,CHAININFO_TARGET_CARDS)
	local sg=g:Filter(Card.IsRelateToEffect,nil,e)
	if #sg>0 then
		Duel.SendtoDeck(sg,nil,SEQ_DECKSHUFFLE,REASON_EFFECT)
	end
end