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| {{Pattern|type=Sawtooth|name=Cord puller|discoverer=Dean Hickerson|discoveryear=1991|pname=cordpuller|c=434|bx=98|by=93|life105=true|life106=true|plaintext=true|rle=true}}
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| '''Cord puller''' is a diagonal [[sawtooth]] that was discovered by [[Dean Hickerson]] on May 14, [[:Category:Patterns found in 1991|1991]]. It has expansion factor 6.
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| It works by firing pairs of [[glider]]s at the back of a [[7-engine Cordership]] so that when the first pair hits the Cordership, a [[block]] is created in the path of the following glider pairs. When those pairs hit the block, it is pulled back closer to the [[gun]] at the southeast. When the block reaches the gun, it is destroyed, allowing the gliders to reach the Cordership again and start the process over again.
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| It population in generation t = 8(6<sup>n</sup>) - 216 (n ≥ 2) is t/36 + 558, but the population in generation 32(6<sup>n</sup>) - 429 (n ≥ 2) is only 469.<ref>[[Alan Hensel]]'s [http://www.ibiblio.org/lifepatterns/ lifep.zip pattern collection].</ref>
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| ==Image gallery==
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| {|
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| |[[Image:Cordpuller_pop.png|thumb|left|The number of alive cells plotted versus the number of elapsed [[generation]]s roughly forms an ever-increasing sawtooth graph.]]
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| |}
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| ==References==
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| <references />
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