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Given an array arr of lowercase strings, determine if the strings can be chained together to form a circle.
A string X can be chained together with another string Y if the last character of X is the same as the first character of Y. If every string of the array can be chained with exactly two strings of the array(one with the first character and the second with the last character of the string), it will form a circle.

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1:58 Explanation
10:44 C++ Code
16:31 Java Code

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