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Sequence 


   Sequence is one of the three basic building blocks of algorithm
   development (the others are selection and iteration) and has two
   basic properties, discreteness and order.  Within an algorithm there
   are first, a series of discrete steps necessary to accomplish a goal
   and second, certain steps must be performed before others, thereby
   imposing order.  As an example, you must first USE a database file
   before you can access its fields.