How many Honey Pots did Pooh Down?

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Winnie the Pooh ate a bit too much honey. He's not feeling well, so asks Piglet to place all the empty pots of the honey he's eaten next to him - all 10 of them. Pooh can't hold his honey, grabs one pot, then another and barfs and barfs. 5 minutes later Piglet cleans up the horrid mess and counts but 4 empty honey pots.

Question:

How many honey pots did Pooh down?