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Given a string, return true if the number of appearances of "is" anywhere in the string is equal to the number of appearances of "not"...
X245: equalIsNot
Given a string, return true if the number of appearances of "is" anywhere in the string is equal to the number of appearances of "not" anywhere in the string (case sensitive).
Examples:
equalIsNot("This is not") -> false
equalIsNot("This is notnot") -> true
equalIsNot("noisxxnotyynotxisi") -> true
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