the distance function to apply to pairs of objects
Method
the method to use
The ei can be numbers or lists of numbers, in which case the default distance function used is EuclideanDistance.
If the ei are strings, the default distance function used is EditDistance.
For small numbers of points, FindShortestTour will usually find the shortest possible tour. For larger numbers of points it will normally find a tour whose length is at least close to the minimum.