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Emit random object in RBD Packed object

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I have several non connected geometries ( extruded Font SOPs.. digits from 0 to 9 for example)

How do I emit one letter at a time (say once every 30 frames) in RBD Packed object in DOP  without creating unnecessary coupling between the DOP and SOP

So far I'm deleting parts of the geo  in SOP so that when the DOP is evaluating the geometry, it only sees one character.

In DOP: creation frame => if($F%30==1,$F,0)

in SOP: upstream from dop import, in delete SOP @textindex*30 <= $F && $F < (@textindex+1)*30

Can you show me to a better solution ?

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