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The definition of ''relation'' given in the next Section formally captures a concept that is actually quite familiar from everyday life.  For example, consider the relationship, involving three roles that people might play, expressed in a statement of the form "''X'' suspects that ''Y'' likes ''Z'' ".  The facts of a concrete situation could be organized in a Table like the following:
 
The definition of ''relation'' given in the next Section formally captures a concept that is actually quite familiar from everyday life.  For example, consider the relationship, involving three roles that people might play, expressed in a statement of the form "''X'' suspects that ''Y'' likes ''Z'' ".  The facts of a concrete situation could be organized in a Table like the following:
   −
{| align="center" border="1" cellpadding="4" cellspacing="0" style="background:f8f8ff; text-align:center; width:60%"
+
{| align="center" border="1" cellpadding="4" cellspacing="0" style="background:#f8f8ff; text-align:center; width:60%"
 
|+ '''Relation S :  X suspects that Y likes Z'''
 
|+ '''Relation S :  X suspects that Y likes Z'''
|- style="background:e6e6ff"
+
|- style="background:#e6e6ff"
 
! Person X !! Person Y !! Person Z
 
! Person X !! Person Y !! Person Z
 
|-
 
|-
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