To be perfectly honest, I'd probably but Abyss ~The Heavens Remix~ as an Easy 10, as it was the first 10 I cleared, but that's probably just me.
Also, if Time to Air is an easy 10, then so are Kachoufuusetsu and Waxing and Wanding, since those are three of the first 10's I passed, and passed all of them with an A first try. This may be my own situation, but the three charts are very very similar in how they play out and the skills needed to pass them.
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