what did the vampire doctor say to his patient?

I need the answer to this joke.

The answer has 14 blanks, adn the last 6 blanks spell the word coffin. The third blank from has an O, and the 6th blank from the begining has an H. Blanks 2, 5, 8 all have the same letter. The remain letters are A C T P.

Ok, here is it less confusing.

_ _ o _ _ h _ _ coffin

1 2 3 4 5 6 7 8

letters remaining : A C T P

blanks 2 5 and 8 have the same letter

the rest of the blanks have a different letter.