ref: d0c3b97a8073e70f3ef3e685bd71cb115d0c2daa
dir: /examples/filter.orca/
......................................... .# FILTER.#.............................. ......................................... ......................................... ......................................... ...............gD........................ ......8D.H............................... ........gE......u........................ ......................................... ......................................... ......................................... ......................................... .........................................