Question: My mobile phone has a 4 number pin code using the values 1 9. To determine this I use a standard algorithm of multiplying the

My mobile phone has a 4 number pin code using the values 1 9. To determine this I use a standard algorithm of multiplying the rst two numbers, subtracting the third and then dividing by the fourth. I change the code by changing the answer to this algorithm I call this the key. What is the largest possible key?

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