SS7 chaper 2-1

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N R P Z S O C I A L C L A S S O O T F U R N O Z X M O S A A C Y I F E T E H M B X B D E M U O A G X W R H B A D O B E I L S S W I K S I H J L P R A A T R O P E L C A U B B M O N H U E P U F S E C Y B R S A P F R D P P A N U R Y A W S P C G E L I I O D Z A G E M V S T L X I K U D R V G C L Z R O C X X U V Q B C Z A O B A V M I H K B O S U Q Q Z N K O C W T D P D L V B O K T Y C A L I W D P N M R R M G E S R E D F E V A U O S E D I C Y F K S N A R M O L M E C Z S M A K O H O H G M P Z T E R R A C E S A C N I