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// Understanding 
// Story: Shadows 
// by The reader 0_0 
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If you don't know what's going on let me explain. Each mane six character have a side story going against the darkness. each duo have two parts.

Fluttershy and Pinkie: A shy party

Rainbow dash and Celestia: nightmare

Twilight and Spike: revealed

Rarity and Applebloom: Apples and diamonds