Interestingly, learning indeed never ends, this will lead to the question I will like to ask more on the subject matter quoted.

I just got to discover this today that some seed phrase could actually be 15, 18 or 21 aside the common ones which are 12 and 24

It keep pondering on my mind in asking why are some seed phrase being generated on different number range and why is 12 and 24 the most common numbers of seed phrase.