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As long as you stick to the correct dimensions for sending a letter (check your local postal service’s requirements), you can use paper wrapping, origami folded paper, homemade envelopes or even folding the letter itself into an envelope (an origami trick). However, this might vary depending on where you live, so always check the local rules and regulations regarding sending letters. And whatever you use, make sure it is strong enough to stay intact during its journey through sorting machines and mail handling!
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