nostr:npub1w2gxxd59h9fyac5vax0zs6xx4pdl784kl3ruvykafaej88fxr02szxfeln 
As I was walking to St. Ives
I met a man with 7 wives
Every wife had 7 sacks 
Every sack had 7 cats
Every cat had 7 kits
kits, Cats, Sacks and wives
How many was going to St. Ives

Quite a mathematical exercise.😂