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I suspect that the weirdness of the suggestions is inversely proportional to the popularity of the "because you purchased" item. It probably lists all items that shared a shopping cart with it, weighted by frequency. A popular item is more likely to have a pattern, while a less popular item will give a grab bag of random items.
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|...............| We live in the nick of times.
| Len 17, Wid 3 |
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