I`m studing about benn diagrams, in my way I stoped here :

**may any one explain to me that "explanation" cause I`m beginner,**

**how we**

**"we get the illustration above right which corresponds to the inclusive OR function of A, B....."**

**how can be that ?**

**"Note that everything outside of double hatched AB is AB-not..."**

**what is everthing ? is it mean the elements of A and B and (AB)' and the univers?**

**or just element of (AB)'**

**may I have an example please? and a simple explanation,,**

**and that is the link below :**

http://www.allaboutcircuits.com/textbook/digital/chpt-8/boolean-relationships-on-venn-diagrams/