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|Number of cells||16|
|Year of discovery||Unknown|
The blockade (or four skewed blocks) is a common formation of four blocks and is one of the familiar fours. A common evolutionary sequence that leads to its formation is known as lumps of muck, which can be seen by letting the stairstep hexomino evolve.
- Mark D. Niemiec. "Life Objects Sorted by Name (F)". Retrieved on April 30, 2009.
- Blockade at Eric Weisstein's Treasure Trove of Life
- Blockade at the Life Lexicon