license: This image is a derivative work of the following images: File:Chess_tile_rl.svg licensed with PD-self 2009-05-03T21:55:38Z Cäsium137 64x64 (3469 Bytes)...
see Image:Chess tile pd.png. Derivative works of this file: Chess tile rl-whitebg.svg Pascal's triangle pathways.svg English determination method: SHA-1...
