Perhaps you should try some spelling variations:
"during environmental and operational conditions" » "during environmental and operating conditions", "during environmental and operational considerations", "during environmental and operational definitions", "measuring environmental and operational conditions", "emerging environmental and operational conditions", "addressing environmental and operational conditions"
"defining environmental and operational conditions" » "defining environmental and operating conditions", "defining environmental and operational considerations", "defining environmental and operational definitions", "mining environmental and operational conditions", "planning environmental and operational conditions", "developing environmental and operational conditions"

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