pub const NODE_MAP: [[(bool, usize, usize); 6]; 26];Expand description
Where each node is written: (has, window offset, k / 2) per beat and bank.
The window is the previous beat followed by the current one, so it
starts at record byte 64·(beat − 1). Node c (record bytes
418 + 18c ..+ 18) is written in the beat where it ends.