I've been trying to improve my J skills by doing the https://adventofcode.com/2022 https://adventofcode.com/2022 puzzles. I got stuck on day 7 because recursion

I've been trying to improve my J skills by doing the https://adventofcode.com/2022 https://adventofcode.com/2022 puzzles. I got stuck on day 7 because recursion in J is possible but an advanced level incantation. Day 1 was five short lines of code for Part One and another two lines for Part Two. Each line of code needed four or five long lines of documentation.