Question 1
Which sign goes in the box? 211 ☐ 23
Which sign goes in the box? 211 ☐ 23
Which sign goes in the box? 13 ☐ 17
Which sign goes in the box? 310 ☐ 310
Five questions on this topic, marked at the end. No hints and no answers along the way — that is what makes the result mean something.
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