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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.

Caption label
CapIdexpression-relation-diagram
CapTypeFigure
Expression relation 
Figure 9 Expression relation
diagram

As an example below is a diagram showing two expressions that are equivalent:

Caption label
CapIddiagram-showing-equivalence-of-two-expressions
CapTypeFigure
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.

Anchor_Ref347417159_Ref347417159 Figure 11 Diagram showing an expression subsumed by and other expression

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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Caption label
CapId-ref347417159figure-11-diagram-showing-an-expression-subsumed-by-and-other-expression
CapTypeFigure
_Ref347417159Figure 11 Diagram showing an expression subsumed by and other expression

Caption label
CapIdshows-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-
CapTypeFigure
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.

Image Added

Caption label
CapId-ref347417377figure-12-diagram-showing-an-expression-that-subsumes-another-expression
CapTypeFigure
_Ref347417377Figure 12 Diagram showing an expression that subsumes another expression

Caption label
CapIdshows-an-expression-top-that-subsumes-an-expression-bottom-again-note-arrows-have-been-used-to-indicate-the-direction-this-relationship-must-be-read-
CapTypeFigure
shows an expression (top) that subsumes an expression (bottom). Again note arrows have been used to indicate the direction this relationship must be 
Anchor_Ref347417377_Ref347417377 Figure 12 Diagram showing an expression that subsumes another expression Figure 12 shows an expression (top) that subsumes an expression (bottom). Again note arrows have been used to indicate the direction this relationship must be
read.

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