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- petrl̤eo
- oil 47
- petroleum 36
- energa̕ 33
- energy 33
- Combustibles 32
- Fuels 32
- energy sources 32
- fuentes de energa̕ 32
- Combustibles fs̤iles 31
- Fossil fuels 31
- gas natural 29
- natural gas 29
- Industria del petrl̤eo 23
- Petroleum industry 23
- Petroleum technology 14
- Tecnologa̕ del petrl̤eo 14
- crudos pesados 13
- heavy crude oil 12
- industria del petrl̤eo 10
- industria petroqum̕ica 10
- oil industry 10
- petrochemical industry 10
- Industria petroqum̕ica 7
- Petrochemical industry 7
- monetizacin̤ de gas natural 7
- natural gas monetization 7
- oil refining 7
- refinacin̤ de petrl̤eo 7
- gas hydrates 6
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