company-index_0   (527)
    Energy_1   (364)
        Coal_2   (12) #####
        Oil_Gas_-_Integrated_3   (23)
        Oil_Gas_Operations_4   (237)
        Oil_Well_Services_Equipment_5   (92)
    Utilities_6   (163)
        Electric_Utilities_7   (101)
        Natural_Gas_Utilities_8   (48)
        Water_Utilities_9   (14) #####
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