ref: 37e65b331bdf98f409be1bd2fbb55aec158c7877
dir: /sys/games/lib/life/c4/
...........x ...........x ...........x ...........x ...........x ...........x ...........x ...........x ...........x ...........x xxxxx.xxxxx.xxxxx.xxxxx ...........x ...........x ...........x ...........x ...........x ...........x ...........x ...........x ...........x ...........x