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Double Flip-Flop

Double Flip-Flop is a combination of Flip-Flop and a Click at both the little finger
side and the thumb side. There are two types of Double Flip-Flop, one is a normal
Double Flip-Flop, and the other is a Double Flip-Flop in Quad.

Here we will talk about the normal one.
When adding a Click to both sides, it creates a Clack Clack --- Clack Clack sound.

This quick Clack Clack sound creates a same sound that will be made by doing
Flip-Flop with two hands. Very useful but kind of hard to get used to the speed.

Difficulty ++++-
Usefulness ++++-
Uniqueness +++--