____________________2.3.     ___159

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		in  . 		 *. . 	
1 1		2		3		
	\\ \	^1 \	fid \ ~ ^"^	t
i / i i / \ \ t \' 1 ' ( 	/ / / /	1 / > /l / m 	t

						Wn ,	
		W1					
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1	2	 [ n	+11	  	w 1	w+11    I ITI I   	w?n1 ^
1 1		\]--| < '\	1	FH			
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1 2 3  

n+1        w w+1         w+n
PHI. 2.24.      

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