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The solution is based on sorting and counting distinct values using wc i.e word count. So for instance, if you have input as 2,2,1 the value of variable c would be 2 since it counts both these 2's as a single 2 alongwith 1. So logically your input 2,2,1 becomes 2,1 and word count gives you a count of distinct lines and thus variable c holds a value of 2 and thus its isoceles.
And if the input is 3,3,3 then all these 3's are counted once and then the wc command would return the value of variable c as 1 and thus it would be equilateral.

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The solution is based on sorting and counting distinct values using wc i.e word count. So for instance, if you have input as 2,2,1 the value of variable c would be 2 since it counts both these 2's as a single 2 alongwith 1. So logically your input 2,2,1 becomes 2,1 and word count gives you a count of distinct lines and thus variable c holds a value of 2 and thus its isoceles. And if the input is 3,3,3 then all these 3's are counted once and then the wc command would return the value of variable c as 1 and thus it would be equilateral.