The New Sudoku Players' Forum

[Chakthi]

I _ T__I__F
S__DF__I_
____N__ST
DN__IS___
TI_N_I_FD
___FR__TI
IT__I____
_F__TF__I
RI_S__T_N

That is a standard 9x9 grid. I used the underscore(_) for blanks. I know the keyword is FINDFIRST and the use of repeat letters is allowed. I have tried to use every solver out there and they all insist on 9 distinct letters in order to work. I thought of assigning the second F and the second I another letter, but since I don't know which Fs and Is are the first or second in the given puzzle, I decided that wasn't an option. I wonder if one of you very smart people would be kind enough to figure this out for me? I know absolutely nothing about Soduko, let alone using letters (and multiples at that!) to solve the puzzle. Thanks in advance for anyone that solves this for me. It's just something where I don't even know where to begin...