Take the outside strip which is on the top (i.e. the right strip) and bend it under two pieces and over one. so that it lies to the left. Now take the same strip and bend it up under one and over one, so that there are two strips to the right and two to the left. Again, use the outside strip which is on the top (i.e. the left strip) and bend it under two and over one to lie to the right. Using the same strip, bend it up under one and over one. Continue in this way, always using the outside strip which is on the top. Weave it under two and over one, then up under one and over one.