Generate a YGOPro Lua script for the following Yu-Gi-Oh card effect:
Both players can Normal Summon "Ancient Gear" monsters for 1 less Tribute. When this card is destroyed and sent to the GY: You can Special Summon 1 "Ancient Gear" monster from your hand, Deck, or GY.
--歯車街
--Geartown
local s,id=GetID()
function s.initial_effect(c)
	--activate
	local e1=Effect.CreateEffect(c)
	e1:SetType(EFFECT_TYPE_ACTIVATE)
	e1:SetCode(EVENT_FREE_CHAIN)
	c:RegisterEffect(e1)
	--decrease tribute
	local e2=Effect.CreateEffect(c)
	e2:SetType(EFFECT_TYPE_FIELD)
	e2:SetCode(EFFECT_DECREASE_TRIBUTE)
	e2:SetRange(LOCATION_FZONE)
	e2:SetTargetRange(LOCATION_HAND,LOCATION_HAND)
	e2:SetTarget(aux.TargetBoolFunction(Card.IsSetCard,SET_ANCIENT_GEAR))
	e2:SetValue(0x1)
	c:RegisterEffect(e2)
	--special summon
	local e3=Effect.CreateEffect(c)
	e3:SetCategory(CATEGORY_SPECIAL_SUMMON)
	e3:SetDescription(aux.Stringid(id,0))
	e3:SetType(EFFECT_TYPE_SINGLE+EFFECT_TYPE_TRIGGER_O)
	e3:SetProperty(EFFECT_FLAG_DAMAGE_STEP)
	e3:SetCode(EVENT_TO_GRAVE)
	e3:SetCondition(s.spcon)
	e3:SetTarget(s.sptg)
	e3:SetOperation(s.spop)
	c:RegisterEffect(e3)
end
s.listed_series={SET_ANCIENT_GEAR}
function s.spcon(e,tp,eg,ep,ev,re,r,rp)
	return e:GetHandler():IsReason(REASON_DESTROY)
end
function s.filter(c,e,tp)
	return c:IsSetCard(SET_ANCIENT_GEAR) and c:IsCanBeSpecialSummoned(e,0,tp,false,false)
end
function s.sptg(e,tp,eg,ep,ev,re,r,rp,chk)
	if chk==0 then return Duel.GetLocationCount(tp,LOCATION_MZONE)>0
		and Duel.IsExistingMatchingCard(s.filter,tp,LOCATION_HAND|LOCATION_DECK|LOCATION_GRAVE,0,1,nil,e,tp) end
	Duel.SetOperationInfo(0,CATEGORY_SPECIAL_SUMMON,nil,1,tp,LOCATION_HAND|LOCATION_DECK|LOCATION_GRAVE)
end
function s.spop(e,tp,eg,ep,ev,re,r,rp)
	Duel.Hint(HINT_SELECTMSG,tp,HINTMSG_SPSUMMON)
	local g=Duel.SelectMatchingCard(tp,aux.NecroValleyFilter(s.filter),tp,LOCATION_HAND|LOCATION_DECK|LOCATION_GRAVE,0,1,1,nil,e,tp)
	if #g>0 then
		Duel.SpecialSummon(g,0,tp,tp,false,false,POS_FACEUP)
		Duel.ShuffleDeck(tp)
	end
end