The problem is asking for tangent circles.
Problem with the third test suite
in 3rd case,
they intersect at two points.
In geometry, tangent circles (also known as kissing circles) are circles that intersect in a single point.
Count up then down
Given a matrix, swap the 2nd & 3rd columns
Compute LOG(1+X) in natural log
Sum My Indices
remove numbers from a string
Connect Four - 04
Summing Rows and Columns
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