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  ADIL E-ON Kerr-McGee Premier
  BP Endeavour Lundin Rocksource
  Bow Valley ERT Maersk RWE
  Centrica ExxonMobil Marathon Shell
  CH4 Faroe Marubeni Silverstone
  Chevron First Oil Monitor Offshore Statoil
  Cieco Hardman Murphy Sterling
  CNR Helix Nexen Senergy
  ConocoPhillips Hess Nippon Oil Talisman
  Cultus Holywell Noble TAQA
  Dana I3 Energy North Sea Energy Tullow
  DECC Idemitsu Oryx UKOG
  DNO IHS Towers Paladin Unocal
  EDP Intrepid Energy Petro-Canada UPB
  ENI IOC Petrofac Venture
  ENS Iona Petro-Summit Vienco
  Enterprise Ithaca Pinnacle  
         
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