title: Assigning people to shopping days by last name for COVID
body: <p>A question from an optimization mailing list:</p>
  
  <p>With COVID-19 my local authorities have experimented with trying to assign people a day of the week to go shopping. They've simply divided by alphabetical order disregarding the frequency with which a surname is used in my town, with terrible results and
  hours of queues. Is there a better way? (The supermarket is open 5 days a week.)</p>
  
  <p>Note: Typically only a list of last names (possibly only popular last names) is available. Communicating who should shop when in a straight-forward fashion is important.</p>