doubt in -prune option

i want to find only the file t4 in directory t3. i am in dir t . the tree is as follows.

if i give,

find .
o/p is
.
./t4
./t1
./t1/t2
./t1/t2/t3
./t1/t2/t3/t4
./t1/t2/t4
./t1/t4

directories are like t/t1/t2/t3 and each directory has file t4.
my question is , i want to find file t4 inside directory t3 without looking in to the other sub directories.on for

how will i use -prune option for that?

i want an o/p like this:
./t1/t2/t3/t4