Presuming you have 4 specific digits such as 1, 2, 3, and 4, there are 24 permutations (4! = 24):
1234, 1243, 1423, 4123, 1324, 1342, 1432, 4132, 3124, 3142, 3412, 4312, 2134, 2143, 2413, 4213, 2314, 2341, 2431, 4231, 3214, 3241, 3421, 4321
I used an online lottery tool to generate these.