Where to put code for random quiz generator?

Christian Schenk has a page with code for a random quiz generator for Contact Form 7:

https://www.christianschenk.org/blog/generate-quiz-contact-form-7/

The code is this:

Here’s a small shell script that generates the necessary code for the quiz tag.

for i in seq 1 9; do for j in seq 1 9; do sum=expr $i + $j test $sum -gt 9 && continue echo -n “\”$i+$j=?|$sum\” ” done done echo

Can anyone tell me how I implement this script?

Thanks in advance.