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. Fig, 1a: Hierarchical representation of goals and schemas PROGRAM Average (input, output)

V. Sum and . Count, Number: INTEGER Average: REAL; BEGIN Sum:=0; Count:=0; REPEAT READLN(Number)

I. Number<>99999, T. Begin, and . Sum, =Sum+Number Count:=Count+1 END; UNTIL Number=99999 Average:=Sum/Count