Hi Don, there is more than one tuning possible- you'll find lots of info and discussions of tunings and fingerings for 4 equidistant string setup in our Group of the same name:
Remember you'll need to click the "join group" button in order to see the discussion replies and comment wall of a group. (You can always click the same button to easily UNjoin later.)
Those irritated by grain of sand best avoid beach.
-Strumelia proverb c.1990