Deadpool 2 end credits: How many post credits are there? Will there be a Deadpool 3?

DEADPOOL 2 hit cinemas this week, giving Marvel heavy-hitter Avengers Infinity War a run for its money. The merc-with-a-mouth comes back again for a wise-cracking sequel, with Ryan Reynolds continuing to break the fourth wall. How many post credits scenes are there, and will there be a Deadpool 3? Major spoilers ahead
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