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Hard · Puzzle #591
2
5
1
6
4
1
8
2
4
9
9
2
2
7
4
6
4
7
8
1
2
6
3
1
5
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