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- operation of multiplication
- operation of national economy
- operation of oil-fired and gas-fired boilers
- operation of ordinals
- operation of overload valve
- operation of plasma ignition system
- operation of polynomials in one variable
- operation of power system
- operation of projecting
- operation of pulverized coal preparation system
- operation of regenerative heater
- operation of rewriting
- operation of sets
- operation of several arguments
- operation of slight oil ignition
- operation of steam turbine oil system
- operation of stream turbine
- operation of substitution
- operation of symmetric difference
- operation of the same kind
- operation of tourism industry
- operation of (ultra) supercritical units
- operation of water-cooled generator
- operation of water-hydrogen-hydrogen cooled generator
- operation of wet-bottom boiler