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3, the imposition of the envelope
In general production, we are accustomed to spelling out envelopes together with “tongues”. This method is more costly (a blank is not used), but the pattern is continuous.
There is also a way to cover the front cover. The "tongue" is done alone. This saves paper, but there is one more "paste", that is, scraping the glue once (or multiplying a double-sided tape) in the finished product. The green part of the figure is the pasted part.

