| http://www.w3.org/ns/prov#value | - The following items are not permitted: Pens, pencils, crayons, markers, writing paper, postage stamps, staples, paperclips, greeting cards, envelopes, foreign substances on the envelope or within the letter, such as glitter, tape, lipstick prints, perfume, cologne, etc., cash, personal checks, identification cards, bank cards, credit cards or phone cards.
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