emr_db.init_examples()
emr_filter.create("f1", "dense_track", time.shift = c(2, 4))
emr_filter.create("f2", "dense_track", time.shift = c(2, 4))
emr_filter.create("f3", "dense_track", time.shift = c(2, 4))
emr_filters.info("f1 | (f2 & f3)")
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