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  1. or download this
    p_id | v_id | s_id
  1  |  1   |  1
...
  2  |  4   |  12
  4  |  4   |  13
  3  |  5   |  14
  2. or download this
         | p_1  | p_2  | p_3  | p_4  |
---------------------------------
...
 v_3 |      | s_9  |      | s_10 |
 v_4 | s_11 | s_12 |      | s_13 |
 v_5 |      |      | s_14 |      |
  3. or download this
         | p_1  | p_2  | p_3  | p_4  |
---------------------------------
...
 v_3 | s_9  | s_10 |
 v_4 | s_11 | s_12 | s_13 |
 v_5 | s_14 |