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it was Mona, but after she dies, a new A comes back. The new A is actually ALI. ali has a twin sister, Courtney. and she was the one that was killed. And it was actually Courtney that was friends with Spencer, Hannah, Emily, and aria. Courtney lived in a mental institute but tricked ali into going. so ali got revenge & killed her, pushing her down the hole. so ali became A to get back at the Pretty Little Liars.
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