Do you want a detailed answer to the math problem of mine clearance in the second grade of primary school?
The symbol is not easy to tick: 1 cross: 2
122
222 1 1222
22 1 1
2 1 1 1 1 1 1
1 1 12 1 1 1
2
2 1 1 1 1 12
2 1 1 1
I only typed what I had to fill in.