32 



BELL SYSTEM TECHNICAL JOURNAL 



3lr«mo^ 33Nia3J3a hohj go 

 31WS iwmoA 3i»WIX0ad<W 



IwmOA 30N3M3J3a woaj 90 

 3TVDS 3Hm(M llVWKOaddV 



3HmoA?DN3a3J3a iKii go 

 31VDS 3wmoA UWIXOadd* 



