45000000-7 Construction work 45214200-2 Construction work for school buildings 45231000-5 Construction work for pipelines, communication and power lines 45300000-0 Building installation work 45311000-0 Electrical wiring and fitting work 45311100-1 Electrical wiring work 45311200-2 Electrical fitting work 45332000-3 Plumbing and drain-laying work
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