emr_db.init_examples()
emr_track.var.set("sparse_track", "test_var1", 1:10)
emr_track.var.set("sparse_track", "test_var2", "v")
emr_track.var.ls("sparse_track")
emr_track.var.rm("sparse_track", "test_var1")
emr_track.var.rm("sparse_track", "test_var2")
emr_track.var.ls("sparse_track")
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