Find the middle - it is Pos 3 (number 4)?, it is Not Pos 3 (number 4) ! Our number is on the left of this, Remove the 4,5,6,7, Keep the 1,2,3, Find the middle - it is Pos 1 (number 2)?, it is Not Pos 1 (number 2) ! Our number is on the left of this, Remove the 2,3, Keep the 1, Find the middle - it is Pos 0 (number 1)?, Yes! Done !

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