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.
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Back to basics 3 - Temp Directory
Create a square matrix of multiples
Cell Counting: How Many Draws?
Generate Golomb's sequence
Abelian Sandpile - 02
Maya - 02
ZigZag - 01
find subscripts from linear index
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