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This is represented by two expression diagrams, one above the other, separated by a relational operator between. The diagram is read top to bottom.
Figure 9 Expression relation diagram
As an example below is a diagram showing two expressions that are equivalent:
Figure 10 Diagram showing equivalence of two expressions
Note that in this example the equivalence relation connects the two expressions with lines – indicating that the relationship is bidirectional and can be read either way.
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Figure 11 shows an expression (top) subsumed by another expression (bottom). Note that arrows have been used to connect the expressions to the relational operator to indicate the direction it must be read.
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