st: Drop observations with multiple zero values

["G. Anderson" <ga274@cam.ac.uk>]

Hi,

Does anybody know how I can drop observations if a number of values are 
zero?
I can do this by manually inputting 

drop if( A==0 & B==0 & C==0) 

But I was wondering if there was any easier way of doing this (especially 
when I have a lot of variables)- perhaps using varlist somehow?

Many Thanks,

Gareth 
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