| http://www.w3.org/ns/prov#value | - In one aspect, the folds 32 and 34 may be provided by adding a stiffening piece or other stabilizing material, such as a cardboard or poster board having a thickness of about 0.01 to 0.1 inch (0.25 to 2.5 mm) at a board weight of about 0.1 to 0.3 gm/in2 (1.5 to 5 gm/mm2).
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