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There should be a little jig included.
It says this on the package: "Plus a special support to be used to close the links."
It's the block in the center of the photo.
You put three or four chevron sections in the cavities on the block, then the bar sections with the "teeth" pointing up, then the flat sections, then crimp.
This is more or less what you want
except A1 and 2x A3 are cast together on the Fruili set.
Also, note in the above picture the top views shows the outside of the tracks and the bottom view shows the inside.
The teeth point away from the chevron side.
If you don't know how the real tracks work it may be difficult to figure out these pieces.
KL