CALAMINE 



N°7. 



a 3 = fb' b*> A 1 ) 



a. e = fb 2 b 1/s h'J 



<z 7 = fi 1 b z/ ? A') 



e 5 = fy b-^yj 



e 3 = fb' v*> y) 

 e, = (b 1 s* y) 



jc = (b*> b'*y) 



= (a* t*y) 



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