ref: e1a9def1933089b3c9f7d4f2a6f265fa03c17e42
dir: /examples/filter.orca/
......................................... .# FILTER.#.............................. ......................................... ......................................... ......................................... ...............gD........................ ......8D.H............................... ........gE......u........................ ......................................... ......................................... ......................................... ......................................... .........................................