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Fold your sheet of A4 paper on diagonal lines as shown on DIG. 1 creasing well.
 
DIG. 1
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You should get a shape as in DIG. 2.
  DIG. 2
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Open it out to give DIG. 3 and then fold along the dotted line shown.
  DIG. 3
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Push in from the two points labelled A on DIG. 3 to give the shape in DIG. 4.
  DIG. 4
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Now flatten out this form and fold along the dotted lines in DIG. 5.
  DIG. 5
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You should now have the form in DIG. 6. Fold along the dotted line on this.
  DIG. 6
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Now you should have the form in
DIG. 7.
  DIG. 7
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Fold along the dotted lines in DIG. 8. If you want cut in some flaps as shown since this plane often requires them. Now you should have the diagram at the top of the page.
  DIG. 8
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