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Hard · Puzzle #915
7
4
1
3
9
5
9
6
3
2
5
8
5
7
6
1
4
8
7
2
1
6
1
8
5
3
9
"Pure mathematics is, in its way, the poetry of logical ideas." — Albert Einstein
"Pure mathematics is, in its way, the poetry of logical ideas." — Albert Einstein
"Pure mathematics is, in its way, the poetry of logical ideas." — Albert Einstein
"Pure mathematics is, in its way, the poetry of logical ideas." — Albert Einstein