draw an AVL tree as each of the following keys are added in the order given. Show intermediate steps. For each of the following values, state whether they would cause a single rotation $($S$),$ a double rotation $($D$)$ or no rotation $($N$)$ when inserted into the AVL tree above. Assume that each value would be inserted into the tree dependent of the other values. write the appropriate letter in the blank next to the value $($S$,$ D$,$ or N$).6,43,7,42,59,63,11,21,56,54,27,20,36$