Look at the Start configuration below and note that there are 12 of each body part: 12 heads, 12 torsos, 12 pairs of legs, etc.
Now look at the End configuration and note that there are 13 of each body part. That makes it seem as if a 13th person has somehow materialized.
But you smart cookies would want to see, in detail, how this was done. Right?
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Try each of these WCD brain teasers: