RFC1321 - MD5 algorithm document

Attempting to implement the MD5 algorithm.

I understand this:
Let [abcd k s i] denote the operation:
a = b + ((a + F(b,c,d) + X[k] + T[i]) <<< s)
...
Let [abcd k s i] denote the operation
a = b + ((a + G(b,c,d) + X[k] + T[i]) <<< s)

But I do not understand this:
Let [abcd k s t] denote the operation
a = b + ((a + H(b,c,d) + X[k] + T[i]) <<< s)
...
Let [abcd k s t] denote the operation
a = b + ((a + I(b,c,d) + X[k] + T[i]) <<< s)

Where the hell did "i" go and what is "t"??? Have I acquired an old RFC document?

U made cuz i fukd you're butte so hard its cryin white and red tears while screaming more then U did

y dont U go cry somewhere else cuz dis.4.o aint no place for fagets that take it in the butte

ure probably was a vergin in the butt sad i know

OWNED IN THE BUTTE BY ME