What are the 3 formations of cup stacking?

The three main formations in cup stacking are the 3-3-3 formation, the 3-6-3 formation, and the cycle formation. The 3-3-3 formation consists of three stacks of three cups each, the 3-6-3 formation features one stack of three cups, one stack of six cups, and another stack of three cups, while the cycle formation combines all cups into a single continuous cycle of stacking and unstacking. Each formation has its own specific techniques and timing strategies that stackers practice to improve their speed and efficiency.