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Function 2 : validParentheses ( arr ) Given a ( possibly empty ) array containing only alphabet letters and parentheses ( , ) , {
Function : validParenthesesarr
Given a possibly empty array containing only alphabet letters and parentheses determine
if the string is valid.
A string is valid if
Open brackets must be closed by the same type of brackets.
Open brackets must be closed in the correct order.
Example: Given input ab your function should return True.
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