use context essentials2021
import lists as L

email-list = 
[list: "milda@brown.edu", "akash@green.edu", "kathi@brown.edu", "nim@harvale.edu", "chen@ricenell.edu", "tessa@green.edu", "lorenzo@brown.edu"]

username-list = [list: "milda", "rob", "tim", "kathi", "spike", "andy", "shriram"]

#|
   - Given a list of usernames and a domain (like "brown.edu"), turn it into a list of email addresses
   
   - Given a list of email addresses and a username (like "kathi"), determine if the username is in use
   
   - Given a list of email addresses, determine if all of them are from brown.edu
   
   - Given a list of email addresses and a domain, determine the length of the longest username with that domain
   
|#