Using techniques such as the ones used in this paper, though, are now being applied to finally get more reliable identification.

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Many of the learning resources, such as toys, booklets, games and drawings, were produced by the teachers themselves (sometimes with the help of students and parents) who used local fabrics and other non-expensive components, such as paper, leaves, wood, and clay.

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Before the introduction of magnetic tape, digital storage for early computers used punched cards, paper tape as well as more exotic technologies such as mercury delay lines and the phosphors on cathode ray tubes.

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