Here I found a short explanation in French, too.  
It's from Doutté and the square with the seals in is a version of the Latin square where, usually a formula or passage from the Qur'an, is repeated in such a way that the same symbol/word only occurs once in each direction. 
If you combine the table from Canaan with the explanation from Doutté I think you will get most of it... 
 
Michael 
 
Reference: Doutté, Edmond. 1909. Magie & religion dans l’Afrique du Nord. Alger: Typographe Adolphe Jourdan.
		 
		
		
		
			
		
		
		
		
		
		
		
		
			
				  
				
					
						Last edited by VVV; 10th December 2012 at 08:54 PM.
					
					
				
			
		
		
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