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| Child pages (Children Display) |
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Some problems are designed to be done by hand (✎) and others require a computer (💻). The amount of time required has been estimated for some problems:
- 🕒 = Less than 15 minutes
- 🕒🕒 = Between 15 and 30 minutes
- 🕒🕒🕒 = More than 30 minutes
Some problems have been grouped into Problem Sets for assigning as homework:
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