def each
      dirs = ["pairtree_root"]
      excludes = []
      for dir in dirs
        Find.find(dir) do |path|
          if FileTest.directory?(path)
            if excludes.include?(File.basename(path))
              Find.prune       # Don't look any further into this directory.
            else
              next
            end
          else
            p path
          end
        end
      end   
    end
def each
      dirs = ["pairtree_root"]
      excludes = []
      for dir in dirs
        Find.find(dir) do |path|
          if FileTest.directory?(path)
            if excludes.include?(File.basename(path))
              Find.prune       # Don't look any further into this directory.
            else
              next
            end
          else
            p path
          end
        end
      end   
    end
---------------------------
 Instance Methods
 ---------------------------