Timing: useful for documentation but not logically necessary.
| Function or value | Description | 
| 
                
              
                  Full Usage: 
                   time f xParameters: 
 'a -> 'b- 
                      The input function.x : 'a- 
                      The input argument for the function.Returns: 'bThe applicationf xplus the CPU time taken to evaluate it. | 
                
 A call  f xitself.
 
 Example
 Evaluates to: |