This is what I need to do to sort out the results from a script:

I know the first half is right, but the second half is what's getting me.
The file has 6 fields like this

word numbers numbers numbers numbers numbers

and I only care about finding numbers in the 6th field that have even numbers. It finds some but not all because when I cat the .txt I can see some of them didn't go over. I know I could copy the rest but I would like to understand how to do it the first time.

Here's what I have:

grep "^[A-Z].*[tcz].* [1-9][02468][0-9]*$" /home/public/data.txt | sort -nk3 | head -83 | tail -43 | sort -nk2 > ~/program.txt


I have cursed and strained over this for awhile. Anyone know what I am doing wrong?

Thanks in advance

Edited to make more sense.