7
6
2
6
8
9
8
9
4
7
4
9
8
5
2
1
7
4
6
5
1
7
6
1
8
9
4
1
5
2
3
1
7
9
8
"Real knowledge is to know the extent of one's ignorance." — Confucius
"Real knowledge is to know the extent of one's ignorance." — Confucius
A hidden pair in a row is often invisible until you track each digit separately through that row.
A hidden pair in a row is often invisible until you track each digit separately through that row.