Summarize the top n and bottom n rows. Essentially concatenate .head() and .tail(). One implementation [here.](https://twitter.com/TedPetrou/status/1248275558116532224) Another [here](https://pandas.pydata.org/pandas-docs/stable/user_guide/options.html). And [here](https://stackoverflow.com/questions/42504984/python-pandas-select-both-head-and-tail)
