three 4" squares folded on diagonal and attached together (ignore the glue mess!) |
four 3 7/8" squares cut on diagonal and attached to outside/inside |
inside (small triangles are 1 3/8" cut on diagonal, optional) |
added simple stop closure (foam tape is only on bottom portion) |
fits in standard A4 envelope (for 4 1/4 x 5 1/2 cards) |
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