How to find first index of an element in array of arrays

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I have an array of arrays like

var arr = [[("aa",1),("b",2)],[("c",3),("dd",4)],[("e",5),("f",6)]]

I want to find first index of dd in arr. I am trying this code but failed to get result

let val = arr.first(where: {$0.1 == "dd" })


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