Easy Brain Teaser for Kids. Question

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Easy brain teaser for kids. Most of our children enjoy spending free time solving various tricky brain teasers, the best source of brain exercise. Here's one of them. It's simple so that kindergarteners can easily cope with it.

Question

5555 = 0
9313 = 1
8193 = 3
8096 = 5
8806 = 6
2581 =?

What number should be instead of the question?

The answer is in the comments.

Comments (1)

Answer

You have to count the closed circles.
The answer is 2.
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