Cis-block on long bookend

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Cis-block on long bookend
x = 5, y = 6, rule = B3/S23 2b2o$2b2o2$4o$o3bo$3b2o! #C [[ THUMBSIZE 2 THEME 6 GRID GRIDMAJOR 0 SUPPRESS THUMBLAUNCH ]] #C [[ THUMBSIZE 3 ZOOM 21 HEIGHT 400 SUPPRESS ]] [[ ZOOM 45 ]]
Pattern type Strict still life
Number of cells 12
Bounding box 6 × 5
Frequency class 20.0
Discovered by Robert Wainwright
Everett Boyer
Year of discovery 1973

Cis-block on long bookend is a 12-cell still life composed of a long bookend and a block.


This still life can be constructed with 4 gliders. Alternate syntheses with five or more gliders can be found in Mark Niemiec's database.[1]

x = 29, y = 14, rule = B3/S23 3bo$4bo3bobo$2b3o4b2o12b2o$9bo13bobob2o$25bob2o$25bo$24b2o$8b3o$10bo$ 9bo2$3o$2bo$bo! #C [[ THUMBSIZE 2 THEME 6 GRID GRIDMAJOR 0 SUPPRESS THUMBLAUNCH ]] #C [[ THEME Book ZOOM 10 AUTOSTART GPS 12 T 0 PAUSE 3 T 50 PAUSE 2 LOOP 51 ]]
A 4G synthesis
(click above to open LifeViewer)


Main article: List of common still lifes

Cis-block on long bookend is the fifty-ninth most common still life in Achim Flammenkamp's census, being less common than eater head siamese eater tail but more common than very long snake.[2]

It is the 60th most common still life on Adam P. Goucher's Catagolue, being less common than cis-boat on dock but more common than very long snake. It is the 7th most common still life with 12 cells, being less common than block on cover but more common than boat tie eater tail.[3]

The still life occurs in final patterns of 7 collisions from the octo3obj database, 2 collisions from the octo3g database,[4] and 1 collision from the octohash database[5].

See also


  1. The 121 twelve-bit still-lifes at Mark D. Niemiec's Life Page (download pattern file: 12/12-28.rle)
  2. Achim Flammenkamp (September 7, 2004). "Most seen natural occurring ash objects in Game of Life". Retrieved on January 15, 2009.
  3. Adam P. Goucher. "Statistics". Catagolue. Retrieved on May 5, 2023.
  4. Headerless RLEs are 15bobo$15b2o$16bo4$o$b2o$2o$5bo$4b2o$4bobo! and bo$2bo$3o5$16bo$17bo$15b3o3$17b3o$19bo$18bo!
  5. Headerless RLE: 7b2o$7bobo$8bo2$9b2o$9bobo$9bo$o$3o$3bo$2b2o!

External links