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  ADIL Enterprise Lundin Pinnacle
  BP E-ON Marathon Premier
  Bow Valley ERT Marubeni Rocksource
  Centrica ExxonMobil Monitor Offshore RWE
  CH4 Faroe Murphy Shell
  Chevron First Oil Nexen Silverstone
  Cieco Hardman Nippon Oil Sterling
  CNR Helix Noble Talisman
  Cultus Hess North Sea Energy TAQA
  Dana Intrepid Energy Oryx Tullow
  DNO IOC Paladin UKOG
  EDP Iona Petro-Canada Unocal
  ENI Ithaca Petrofac Venture
  ENS Kerr-McGee Petro-Summit Vienco
         
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