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- labor remuneration 3
- labor resources 9
- labor safety 2
- labor sphere 1
- labor standardization 3
- labor standards 3
- labor stimulation 1
- laboratory and practical classes 2
- laboratory and practical lessons 2
- laboratory classes 3
- laboratory practicum 2
- laboratory sessions 1
- laboratory studies 1
- laboratory work 8
- laboratory works 5
- labour 5
- labour activity 1
- labour behaviour 1
- labour economics 3
- labour force 1