st: Slicing data set

["Pedro Martins" <pmrsmartins@gmail.com>]

Dear all,

I want to save subsets of a large data set into smaller files. Since
<save> doesn't allow for an <if> condition, I'm using a loop include
<preserve> and <restore>. Is there a more time-efficient way of
slicing one's data?

Thank you

Pedro Martins
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