Reference

All functions
auto	Automotive
college	American University Scoreboard
counties	County and City Data Book
find_keys()	Determine which column(s) is(are) a key for the data
first_normal()	Function to check whether a dataset is in first normal form
is_key()	Assess whether a proposed set of variables is a key
is_key_cached()	To speed up how is_key is applied in the first, second, and third_normal function
no_duplicates_cached()	Reduces the amount of keys being stored by reducing redundant information
second_normal()	function to check whether a dataset is in second normal form
third_normal()	Function to check whether a dataset is in third normal form