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EX-5.1.2 - EX-5.1.2 - NATIONAL FUEL GAS COd936269dex512.htm
EX-5.1.1 - EX-5.1.1 - NATIONAL FUEL GAS COd936269dex511.htm
EX-4.1.1 - EX-4.1.1 - NATIONAL FUEL GAS COd936269dex411.htm
EX-1.1 - EX-1.1 - NATIONAL FUEL GAS COd936269dex11.htm
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