From Twin Triangles.
Do a total of three Triangle Circulates except that when you become 1) the Apex
dancer (for Apex-to-Apex Triangles), or 2) the In-Facing Base dancer
(for Base-to-Base Triangles); do your next Circulate to the other Triangle.
(From Apex-to-Apex Triangles, the Circulate is an Interlocked Triangle
Circulate; from Base-to-Base Triangles, the Circulate is to the diagonal
opposite position.) Exchange The Triangle can be fractionalized into
thirds.
Note: As with all Exchanges, do Circulates staying on the inside of your
formation until the crossover point, and then do Circulates staying on the
outside of the other formation (and adjust to end on footprints of the original
formation).
See also Exchange The Box [C3A].