Unity games are often laid out like this - I believe it's because these games all use the same engine to generate their sheets. I'm not sure there is any structure to it but there must be some sort of table in these games that refer to the individual sprite locations in these files.
Tsunami Bomb - The Simple Truth
We could run away
Leave behind anything paper
Not knowing where we're going to stay
When there's no Mondays
You're part of me, it's so easy to see the simple truth
When I'm in your arms, I feel safe from harm and sorrow too
You're part of me, it's so easy to see the simple truth
But most of all, nothing couldn't be solved when I'm with you