The basic pattern is a maximum of six weeks at school followed by a maximum of four weeks holiday.

BBC: Gove urges longer days and shorter holidays for pupils

Although many are loaded with basic heuristics for pattern recognition, their true power comes from their ability to improve as more data is passed through them.

FORBES: The Limits Of Big Data Marketing

One of the most basic parts of that arrangement, though, is immediately obvious from the picture of spots in the pattern.

ECONOMIST: The 2011 Nobel prizes