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First of all, fold along every crease line on both strips, back and
forth, ready for easy flexing.
- Now join the two strips in diagram 1. together with glue or
double sided tape - both faces marked u stay facing up.
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Now go through each diagram in order.
Each diagram (except 13.) has a heavy line with 2 faces marked
u and d. Fold along the heavy line, so that after
the fold the faces u and d are together, with
u facing up and d facing down onto the table.
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At diagram 13., there is a triangle underneath y.
Tuck the mini strip x and y beneath this, so
you can only see x.
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In the second to last diagram, stick the two faces u and
d together with glue or double sided tape.
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