oh , awsome nested set gem arrenges item like a tree , to is like

                                             root
                                                |
                                  ________|__________
                           left  |            item             | right
                      ______ |__           |      ______|______



you see item has a left and right sibling, the gem saves ,   the parent_id
of item , in this case root and the item of the item to the left and to the
right

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