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- 42 - Prove that $d$ is the greatest common divisor. Felipe, Maggie
- 45 -
- 46 - Joseph
- 50 - Jacob (almost), Felipe, Vladimir
- 53 - Felipe
- 54 - Veith, Jacob, Maggie, Vladimir
- 55 - Rachel, Jacob, Vladimr
- 56 - Felipe, Maggie, Vladimir
- 57 - Felipe, Maggie, Jacob
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