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Consider the following recursive algorithm, where arr refers to an array type input.
[3]
function mystery(arr, i) if i = 0 output "not found" return false if arr[i - 1] = 7 then output i return true else mystery(arr, i - 1) end if end function
State the output of mystery( [3,1,5,7,9,2] , 6 ) and describe what the mystery function generally achieves when the initial inputs for arr and i refer to an array and its corresponding length respectively.

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