Search for flight from SFO to JFK
         prefer "American" or "United"
         departs 1-June-2000
         arrives before 10:30PM
         priced less than $450

or:

Buy 1000 shares of "Acme" symbol ACME
         at or below $4.60
         expires on 6-June-2000
         account #ACN-456-987
         confirm with luke@rebol.com

Example 4: More complex examples.