It starts with S and end with X

Do you know which word starts with S and end with X?


Lemme give you a hint:


It usually has high amount of activity


and also has lot of Up and Down movement....

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Got it???????
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Come on... Think about it!!!!!!!!!! !
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Just a little more.......
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Give up?????????? ??
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Its pretty simple...... ......... .. SENSEX

But I like the way you are thinking:)