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Write out the possibilities in an order that guarantees you cannot skip one or write one twice. Alphabetical, smallest first, or by a fixed rule - the order matters less than having one. This is the skill underneath almost every other counting skill.
Saved in this browser only. No account, nothing sent anywhere.
Nothing. This is one of the skills the Atlas starts from.
No indexed official paper question has been tagged with CNT-01 yet. The index grows one paper at a time, and it records only question numbers, point values and our own skill tags — never the problems themselves.