Untitled

+-------------+
      |             |
      |  Email (E) | 
      |             |
      |  40        |          +-------------+
      |             |          |             |
      |    40      |<----------|   IM (I)   | 
      |             |          |             |
      |  20        |          |             |
      |             |          |             |
      +-------------+          +-------------+
      |   Neither: 20           (outside both)
      +-------------------------+