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Step 11: Fold each corner over to the bottom left corner
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Step 12: As you fold, your paper should look like this
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Step 13: Keep folding!
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Step 14: Press down your new folds to create this square
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Step 15: Turn the square anticlockwise so it is now a diamond shape
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Step 16: Fold the top layers of paper inwards to meet the centre crease line, creating the green crease lines
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Step 17: Press the folds down and it should look like this
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Step 18: Fold the tip of the paper down
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Step 19: Your paper should now look like this
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Step 20: Open up the folds so your paper looks like this