10. “The set of products p such that p was a daily top-seller exactly once. I.e., the set of products p such that there is exactly one day d such that p had the largest sales amount on d”
11. “For every day d1, there exists exactly one day d2 such that the sum of the sales amounts of product 3 on d1 and on d2 is equal to 10”
12. “For all days d, there are 3 different products that account for at least 90% of the total sales on d”
13. “The set of products with the most days without any sales”
14. “The set of products with the largest number of consecutive non-zero sales days (i.e., days with sales amounts greater than 0), where that number must be greater or equal to 2”
15. “For any two consecutive days, the number of products with sales amount 0 is not increasing. I.e., for all days d, d has at least as many products with no sales as the next day d+1 (if it exists)”
16. “There are (at least) two products such that the sum of their sales amounts remains constant across all days”