ref: 0cf19ce2fc9eedd9a1c84e30bb12e657bd5db6f2
dir: /examples/filter.orca/
......................................... .# FILTER.#.............................. ......................................... ......................................... ......................................... ...............gD........................ ......8D.H............................... ........gE......u........................ ......................................... ......................................... ......................................... ......................................... .........................................