Here is an interesting cross number puzzle. Place the nine digits 1 through 9 in the grid below,
one digit per box, so that the three-digit numbers formed fit the clues.
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1
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2
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3
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4
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5
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ACROSS
1. A number with decreasing digits
4. A prime number
5. A prime number
DOWN
1. A prime number
2. A prime number
3. A prime number
DIAGONAL
1. A prime number
3. A prime number