Generate a YGOPro Lua script for the following Yu-Gi-Oh card effect:
Cannot be Summoned unless you control a face-up "Gravity Axe - Grarl". If this is the only card in your hand, you can Special Summon it (from your hand).
--ガーディアン・グラール
--Guardian Grarl
local s,id=GetID()
function s.initial_effect(c)
	--sum limit
	local e1=Effect.CreateEffect(c)
	e1:SetProperty(EFFECT_FLAG_CANNOT_DISABLE+EFFECT_FLAG_UNCOPYABLE)
	e1:SetType(EFFECT_TYPE_SINGLE)
	e1:SetCode(EFFECT_CANNOT_SUMMON)
	e1:SetCondition(s.sumlimit)
	c:RegisterEffect(e1)
	local e2=e1:Clone()
	e2:SetCode(EFFECT_CANNOT_FLIP_SUMMON)
	c:RegisterEffect(e2)
	local e3=e1:Clone()
	e3:SetCode(EFFECT_SPSUMMON_CONDITION)
	c:RegisterEffect(e3)
	--spsummon
	local e4=Effect.CreateEffect(c)
	e4:SetType(EFFECT_TYPE_FIELD)
	e4:SetCode(EFFECT_SPSUMMON_PROC)
	e4:SetProperty(EFFECT_FLAG_UNCOPYABLE+EFFECT_FLAG_CANNOT_DISABLE)
	e4:SetRange(LOCATION_HAND)
	e4:SetCondition(s.spcon)
	c:RegisterEffect(e4)
end
s.listed_names={32022366}
function s.cfilter(c)
	return c:IsFaceup() and c:IsCode(32022366)
end
function s.sumlimit(e)
	return not Duel.IsExistingMatchingCard(s.cfilter,e:GetHandlerPlayer(),LOCATION_ONFIELD,0,1,nil)
end
function s.spcon(e,c)
	if c==nil then return true end
	local tp=c:GetControler()
	return Duel.GetLocationCount(tp,LOCATION_MZONE)>0
		and Duel.GetFieldGroupCount(tp,LOCATION_HAND,0)==1
		and Duel.IsExistingMatchingCard(s.cfilter,e:GetHandlerPlayer(),LOCATION_ONFIELD,0,1,nil)
end