user: From the passage provided, extract the number of episodes that made up the seventh series of Waterloo Road.

assistant: The seventh series of Waterloo Road had thirty episodes.

user: What is summer break?

assistant: Schools and universities typically have a summer break to take advantage of the warmer weather and longer days. In almost all countries, children are out of school during this time of year for summer break, although dates vary.

user: In what way did Étienne Halphen interests lead to him discovering the harmonic distribution?

assistant: He had become interested in the statistical modeling of natural events.  This motivated him to find a system that provided sufficient flexibility to fit a large variety of data sets.