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good he changed his ways after Lily and James were being hunted by Voldemort for their son Harry and Snape's love Lily caused him to join the order and to protect lily's son even though Snape hated James for taking Lily for him and almost getting him (Snape) killed even though James saved him and it was Sirius who's falt it was the Snape almost got killed by Lupin.

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