Excuse me! I want to delete the first my comment (but there is no such possibility on the site). I could not determine the algorithm for determining the secret word. And it was not possible for me to learn this algorithm. My opinion is that it would be easier if there were two tests in the task definition, simple and difficult (or medium).

the test for 'whatisup' and the description of the problem condition are absolutely not suitable for the secret 'mathisfun'!!!

try:
secret441 = "abc"
triplets441 = [
['c','b','a'],
['a','b','c']
]

Absolute dislike for such a task!!! WRITE IN THE TASK CONDITION ALLOWED RANGE n!!!

This is the wrong solution! Need a 'column addition algorithm'! example: (https://www.mathsisfun.com/numbers/addition-column.html)

There were other definitions of functions in the task condition... example: 'function zero()' not 'const zero'. Not Fair!

I haven't forgotten about js 'eval()' - so I have a little different solution :)