Answer Posted / lester

If the letters are thought to be unique than the answer is: 2*2*2*2=8
If the letters are thought to be identical(as in spam mails) than the answer is:
(5,0,0) (4,1,0) (3,2,0) (2,3,0) (1,4,0) (0,5,0)
(4,0,1) (3,1,1) (2,2,1) (1,3,1) (0,4,1)
(3,0,2) (2,1,2) (1,2,2) (0,3,2)
(2,0,3) (1,1,3) (0,2,3)
(1,0,4) (0,1,4)
(0,0,5)
1+2+3+4+5+6 = 21 ways
~Lester

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