After discovering that there are 24 MacMahon triangles that can be
made with four colours, it simply remains to find an arrangement of them
that meets the conditions that:
- The numbers/colours round the edge of the T-hexagon are all the
same.
- The numbers/colours along an edge that is common to 2 triangles
are the same.
We don't have any suggestions as to how you might go about this, but
at least we do have solutions in both numbers and colours that you can
check your solution against.

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