By adding a distinction for every sheet bundle of a same delivery destination and ejecting the sheet bundle, a sorting burden on the user is reduced. The test structure and related methods are applicable within the context of three-dimensional integrated circuits. The protective coating comprises a non-polymeric material which is capable of forming a covalent bond with the substrate and is removed from the substrate without damaging the ink ejection element following slot formation. The grip has a body portion and an outwardly protruded engaging portion.