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  1.                  environ
  2.                     |
  3.                     |
  4.                     V
  5.                |----------|                      |----------|       
  6.                |   cons   ⁿ                      ⁿ   cons   ⁿ       
  7.                |----------|                      |----------|       
  8.                |      -------------------------> |      ------> rest of NIL 
  9.                |----------ⁿáááááááááááá          |----------ⁿ   environment    
  10.                |          |                      |          |   list    
  11.                |----|-----|                      |----|-----|       
  12.                     |                                 |             
  13.                     V                                 V             
  14.                |----------|     |----------|       pointer to secondì
  15.                |   cons   ⁿ     ⁿ   cons   ⁿ       bindingì
  16.                |----------|     |----------|ì
  17.                |      --------->|      ------> NILì
  18.                |----------|     |----------|ì
  19.                |          |     |          |ì
  20.                |----|-----|     |----|-----|ì
  21.                     |                |      ì
  22.                     V                V             ì
  23.                |----------|     |----------|ì
  24.                | variable ⁿ     ⁿ constant ⁿì
  25.                |----------|     |----------|ì
  26.                |    X     |     |   joan   |ì
  27.                |----------|     |----------|
  28.  
  29.  
  30. Figure 9 - A typical environment showing X bound to joan .
  31.