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.
Alphabetize by last name
Determine if a Given Number is a Triangle Number
Who knows the last digit of pi?
subtract central cross
Ugly numbers - 01
Abelian Sandpile - 01
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