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Here's a couple examples:
- What numbers are people least/most likely to notice missing in an ordered list of numbers? E.g. If you ask people to quickly scan the list [60,61,62,63,64,65,66,67,68,69], which element when taken out would have the highest/lowest % of people who respond that there are no missing elements? Is it numbers that end in 7? Maybe people always notice when numbers with repeated digits are missed (66).
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