Group Statement of Cash Flow

For Cash Flow from operating activities, Do we include all the items below under "Adjustments for": Impairment of asset (Non cash item) (Profit)/ Loss on disposal of PPE (it is an investing activity) (Gain) / Loss on Sale of sub ( it is an investing activity; will there be a gain or loss on sale of associate?) If this should not be included here, hope i can get an explanation on why is it so? Thanks