Generate a YGOPro Lua script for the following Yu-Gi-Oh card effect:
2 Level 4 monsters
--ジェムナイト・パール
--Gem-Knight Pearl
local s,id=GetID()
function s.initial_effect(c)
	--xyz summon
	Xyz.AddProcedure(c,nil,4,2)
	c:EnableReviveLimit()
end