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Starting a giveaway

If no channel is provided, it will default to the current one. 
/gw start <duration> <winners> [channel] <prize>

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Ending or rerolling giveaways

You can end a giveaway early or reroll the winners of a giveaway that has ended. If you need help with getting the Message ID, visit this page. 
/gw end <message_id>
/gw reroll <message_id>