The specific operation steps are as follows:
1. Cut out the front cover and back cover of the voucher and stick them on the front and back of the voucher respectively, and then stick a piece of paper with the same texture on the upper corner of the cover as a corner protector;
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2. Draw an isosceles triangle with a side length of 5cm in the upper left corner of the voucher, clamp it, and evenly punch two holes on the bottom line with a binding machine;
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3. Pass the needle lead through the two holes, or straighten the clip, then fold the two ends in the same direction, pass the thread through the middle and clamp it, so that the lead can tie a fast knot on the back of the certificate;
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4. Fold the corner protector to the upper left corner, cut one side to the upper left corner of the voucher, apply glue, fold it back, and stick the thread buttons on the side and back firmly.
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