Question 44688
Any of 26 letter can be in any of 4 spots, so there are 26^4 = 456,976 possibilities
If there is no repeating, then the answer is less, because, even though 26 letters can be first, only 25 can be second, 24 can be third, and 23 can be last, so we get
26 x 25 x 24 x 23 = 358,800 possibilities