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The complete list is 7.
0000, 0001, 0002, 0003, ... up to 9999. The complete list would have 10,000 elements, and would serve no useful purpose.
Any four-digit number that ends with 0, or with 5: 1000, 1005, 1010, 1015, ... 9990, 9995. If you want to have the complete list, I'll leave this fun part to you. Better write a computer program to list them.
That's an infinite list.
That's an infinite list.