ref: 6c334dce95d0acb7b28426b3e7fb8fc745ac56b2
dir: /examples/filter.orca/
......................................... .# FILTER.#.............................. ......................................... ......................................... ......................................... ...............gD........................ ......8D.H............................... ........gE......u........................ ......................................... ......................................... ......................................... ......................................... .........................................