Load in all the excel sheets within the workbook

Create a DataFrame just like the shipping sheet, but with each state abbreviation replaced by its full name.

Get the corresponding full state name from the states dataframe, and then apply that to a copy of the shipping dataframe

The “adjacent” column in the distances DataFrame should be boolean type; convert it.

Add two columns to the shipping table, one containing the distance between the two states, and the other containing the boolean of whether the two states are adjacent, both taken from the distance table.