The grid is incorporated partly on opposite sides of a sheet related to the questions and answer alternatives, partly answer markings in corresp. coordinates. The answer alternatives are not marked on the sheet, but on an overlay of plastics foil using a white board marker. This foil can be wiped clean mechanically for re-use. The sheet with the grid and answer markings can be stored in a collection folder or file to which the plastics foil is attached.
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