My list looks like the following:  

`['https://www.enbridge.com/Projects-and-Infrastructure/For-Shippers/Tariffs/Enbridge-Bakken-Pipeline-Company-Inc-Bakken-Canada-tariffs.aspx/~/media/Enb/Documents/Tariffs/2021/BAK CAN CER 37.pdf', 'https://www.enbridge.com/Projects-and-Infrastructure/For-Shippers/Tariffs/Enbridge-Bakken-Pipeline-Company-Inc-Bakken-Canada-tariffs.aspx/~/media/Enb/Documents/Tariffs/2020/BAK CAN CER 34.pdf', 'https://www.enbridge.com/Projects-and-Infrastructure/For-Shippers/Tariffs/Enbridge-Bakken-Pipeline-Company-Inc-Bakken-Canada-tariffs.aspx/~/media/Enb/Documents/Tariffs/2021/BAK CAN CER 38 FERC 3120 BAK US.pdf']`

And I want to grab each of the CER # off the end of each element and create a dictionary that has the CER # as the key and the entire element as the corresponding output.

For example, the dictionary would look like the following:  

`tariffs = {'CER 37': 'https://www.enbridge.com/Projects-and-Infrastructure/For-Shippers/Tariffs/Enbridge-Bakken-Pipeline-Company-Inc-Bakken-Canada-tariffs.aspx/~/media/Enb/Documents/Tariffs/2021/BAK CAN CER 37.pdf', etc.}`

So if I look up the tariff name, it will output me the correct PDF.