## Min
var = None
for key in assignment:
	if len(assignment[key]) > 1: #Checks to see if the domain has a bigger size than 1
		var = key #Sets the key to be returned
	return var
## din
for key in assignment.keys(): # Go through the variables.
	if len(assignment[key]) > 1: # Find an unassigned variable.
                return key # Return an unassigned variable.
        return None # Return None if all variables were assigned.