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Give the decription of user case
A use case is a description of the set of the sequence of actions which a system performs to produce an observable result which is of a value to an actor. The user is known as actor and process is depicted by use case. The notation for use case is below:
Figure: Relationship between actor and use case
Define addressing modes. The dissimilar ways in which the location of an operand is specified in an instruction are referred to as addressing modes.
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