Locates a pict designated by find is within pict. If find is a pict, then the pict must have been created as some combination involving find.

Returns #t if v is a pict or a non-empty list of picts.

Creates a pict that has the same drawing and bounding box of pict, but which hides all of its sub-picts so that they cannot be found with functions like lt-find. If pict has a last-line pict, then the laundered pict has a fresh last-line pict with the same shape and location.