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- operating resource 1
- operating technology 2
- operating time 2
- operation 32
- operation conditions 1
- operation cost 1
- operation costs 1
- operation duration 1
- operation efficiency 3
- operation life 1
- operation management 1
- operation modes 2
- operation modules 1
- operation of business 1
- operation of freight wagons 1
- operation of gas networks 1
- operation of the track circuit 1
- operation parameters 1
- operation rate coefficient 1
- operation security 2