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{| align="center" cellspacing="6" width="90%"
 
{| align="center" cellspacing="6" width="90%"
|
+
| align="center" |
 
<pre>
 
<pre>
 
o-----------------------------------------------------------o
 
o-----------------------------------------------------------o
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{| align="center" cellspacing="6" width="90%"
 
{| align="center" cellspacing="6" width="90%"
|
+
| align="center" |
 
<pre>
 
<pre>
 
o-----------------------------------------------------------o
 
o-----------------------------------------------------------o
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{| align="center" cellspacing="6" width="90%"
 
{| align="center" cellspacing="6" width="90%"
|
+
| align="center" |
 
<pre>
 
<pre>
 
Table 18.  Relational Composition P o Q
 
Table 18.  Relational Composition P o Q
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