A package of 4 mechanical pencils comes with 2 free erasers. If you get the total of 12 free erasers, how many packages of penci
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1. ( in this inequality, the time can be less than or equal to 45, but no more than 45)
2. (Mario's height is more than 60.)
3. (More than 8000 fans attended.)
Your goal is to fill in the whole grid with numbers, making sure no number is repeated in any row or column. When it is 4x4 you have to use numbers 1,2,3,4.
