A process for producing {TAIL ~ polyethylene comprises} polymerizing ethylene or copolymerizing ethylene with other α olefin in the presence of a catalyst system obtained by bringing the following components to in {HEAD ~ contact} with one another: 
A process for producing { TAIL ~ polyethylene comprises } polymerizing ethylene or copolymerizing ethylene with other α olefin in the presence of a catalyst system obtained by bringing the following components to in { HEAD ~ contact } with one another :
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