Generate a YGOPro Lua script for the following Yu-Gi-Oh card effect:
This card can only be activated when both players have 2 monsters or less on their respective sides of the field. Both players can only Normal Summon up to 2 additional monsters on their sides of the field.
--狭き通路
--Narrow Pass
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)
	e1:SetCondition(s.condition)
	c:RegisterEffect(e1)
	--
	local e2=Effect.CreateEffect(c)
	e2:SetType(EFFECT_TYPE_FIELD)
	e2:SetRange(LOCATION_SZONE)
	e2:SetCode(EFFECT_CANNOT_SUMMON)
	e2:SetProperty(EFFECT_FLAG_PLAYER_TARGET)
	e2:SetTargetRange(1,1)
	e2:SetTarget(s.sumlimit)
	c:RegisterEffect(e2)
end
function s.condition(e,tp,eg,ep,ev,re,r,rp)
	return Duel.GetFieldGroupCount(tp,LOCATION_MZONE,0)<=2
		and Duel.GetFieldGroupCount(tp,0,LOCATION_MZONE)<=2
end
function s.sumlimit(e,c,sp,st)
	return Duel.GetFieldGroupCount(sp,LOCATION_MZONE,0)>=2
end