S l/
l SS S /
nerv /
/sac /
/SSSS :/ C H A I N
/ SS S R E A C T I O N
l l ,
, S, ,SlS, ,SS, ,SS, ,S,
,/ /l/
l / /SS /SS /SS SS /SS l /
W E L C O M E
2 C H A I N R
E A C T I O N