Mind Ninja Pattern: Rusty Chain

A chain of stones, consisting of either all red stones or all grey stones, where every triplet of stones in the chain forms a 120 degree angle. Links from different sections of the chain may touch, but may not cross over one another. You should specify a minimum chain length when proposing this pattern, as a way to balance the goals of builder and blocker. Append the minimum chain length to the end of this pattern's name when proposing it. For example, you might say "Rusty Chain 12", which means that the builder must build a rusty chain with at least 12 stones in it. The pattern may be embedded.

Here is an example:

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