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envelope
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envelope

In geometry, a curve that touches all the members of a family of lines or curves. For example, a family of three equal circles all touching each other and forming a triangular pattern (like a clover leaf) has two envelopes: a small circle that fits in the space in the middle, and a large circle that encompasses all three circles.



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[ILLUSTRATION OMITTED] 1 The envelope: The piece comes in the mail in an oversized, black window envelope.
The second was a small window envelope enclosing a typewritten index card, showing the donor's giving history.
If you're writing a non-personalized letter that's going out bulk rate in a window envelope using teaser copy, a Johnson Box will fit right in.
 
 
 
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