Generate a YGOPro Lua script for the following Yu-Gi-Oh card effect:
Each time a "Six Samurai" monster(s) is Normal or Special Summoned, place 1 Bushido Counter on this card. You can send this card to the GY; Special Summon 1 "Six Samurai" or "Shien" Effect Monster from your Main Deck, whose Level is less than or equal to the number of Bushido Counters on this card.
--紫炎の道場
--Shien's Dojo
local s,id=GetID()
function s.initial_effect(c)
	c:EnableCounterPermit(COUNTER_BUSHIDO)
	--Activate
	local e1=Effect.CreateEffect(c)
	e1:SetType(EFFECT_TYPE_ACTIVATE)
	e1:SetCode(EVENT_FREE_CHAIN)
	c:RegisterEffect(e1)
	--add counter
	local e2=Effect.CreateEffect(c)
	e2:SetType(EFFECT_TYPE_FIELD+EFFECT_TYPE_CONTINUOUS)
	e2:SetRange(LOCATION_SZONE)
	e2:SetCode(EVENT_SUMMON_SUCCESS)
	e2:SetOperation(s.ctop)
	c:RegisterEffect(e2)
	local e3=e2:Clone()
	e3:SetCode(EVENT_SPSUMMON_SUCCESS)
	c:RegisterEffect(e3)
	--special summon
	local e4=Effect.CreateEffect(c)
	e4:SetCategory(CATEGORY_SPECIAL_SUMMON)
	e4:SetDescription(aux.Stringid(id,0))
	e4:SetType(EFFECT_TYPE_IGNITION)
	e4:SetRange(LOCATION_SZONE)
	e4:SetCost(s.spcost)
	e4:SetTarget(s.sptg)
	e4:SetOperation(s.spop)
	c:RegisterEffect(e4)
end
s.listed_series={SET_SIX_SAMURAI,SET_SHIEN}
s.counter_place_list={COUNTER_BUSHIDO}
function s.ctfilter(c)
	return c:IsFaceup() and c:IsSetCard(SET_SIX_SAMURAI)
end
function s.ctop(e,tp,eg,ep,ev,re,r,rp)
	if eg:IsExists(s.ctfilter,1,nil) then
		e:GetHandler():AddCounter(COUNTER_BUSHIDO,1)
	end
end
function s.spcost(e,tp,eg,ep,ev,re,r,rp,chk)
	if chk==0 then return e:GetHandler():IsAbleToGraveAsCost() end
	local ct=e:GetHandler():GetCounter(COUNTER_BUSHIDO)
	e:SetLabel(ct)
	Duel.SendtoGrave(e:GetHandler(),REASON_COST)
end
function s.filter(c,ct,e,tp)
	return c:IsLevelBelow(ct) and (c:IsSetCard(SET_SIX_SAMURAI) or c:IsSetCard(SET_SHIEN)) 
		and c:IsType(TYPE_EFFECT) 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_DECK,0,1,nil,e:GetHandler():GetCounter(COUNTER_BUSHIDO),e,tp) end
	Duel.SetOperationInfo(0,CATEGORY_SPECIAL_SUMMON,nil,1,tp,LOCATION_DECK)
end
function s.spop(e,tp,eg,ep,ev,re,r,rp)
	if Duel.GetLocationCount(tp,LOCATION_MZONE)<=0 then return end
	local ct=e:GetLabel()
	Duel.Hint(HINT_SELECTMSG,tp,HINTMSG_SPSUMMON)
	local g=Duel.SelectMatchingCard(tp,s.filter,tp,LOCATION_DECK,0,1,1,nil,ct,e,tp)
	if #g>0 then
		Duel.SpecialSummon(g,0,tp,tp,false,false,POS_FACEUP)
	end
end