Flavor Step!

A playable chart if you're careful with the half-twists and high-angle twists, including the crossover in the final late section.

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like a 13 until the last 3 seconds

The late spike crossover is a 15, but everything else is a 14. Since the double is faster than the single, unless you're just barely scratching the surface of this level, it's a good entry-level 15.