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Appendix
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Envelopes with side seam construction
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Highly textured envelopes, or with extremely shiny surfaces
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Envelopes that seal by removing a peel-off strip
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Envelopes with more than one flap to be sealed
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Self-adhesive envelopes
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Envelopes that are baggy or not sharply creased
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Embossed envelopes
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Envelopes that have previously been printed on