Question: Let A = { w in { 0 , 1 , . . . , 9 } | w 6 = and the last (

Let A ={w in {0,1,...,9}| w 6= and the last (rightmost) digit in w has not appeared in the string before}. For example, the strings 3261,2024,0 are all in A, but the strings 5785,1999,00 are all not in A. Prove that A is regular.

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