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