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design and gate in the sand. in a container sealed by a glass plate, there is sand. a magnet placed outside on the glass plate in a few pieces ferromagnetici internal to the container in contact with the sand. manoeuvre
design and gate in the sand. in a container sealed by a glass plate, there is sand. a magnet placed outside on the glass plate in a few pieces ferromagnetici internal to the container in contact with the sand. manoeuvre