11.   Primary chronic intestinal pseudo-obstruction occurs without underlying systemic disease.

12.   It can be caused by a high level of oxygen in premature babies, but it can occur without artificial administration of oxygen.

13.   The heat transfer can occur without a corresponding diffusion of salt because of the lower diffusivity of the latter.

14.   Endogenous or unipolar depression has a biochemical basis, often occurring without apparent reason.

15.   Many farms had more family workers than could be fully employed, and so migration to the cities could occur without loss of food output.

16.   Adjustment to full employment could in principle occur without any tendency towards inflation.

17.   And all this occurs without actually experiencing the consequences of even the most outrageous behavior.

18.   And not a thought or an action can occur without its being underlined by reference to some popular song or phrase or book.

19.   And the transformation occurred without Don Mattingly, the admirable figure known as Donnie Baseball who made the mistake of retiring a year too soon.

20.   As an added fillip to share prices, this bonanza occurred without the usual drawback a weakening currency brings --accelerating inflation driven by higher import prices.