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- external threats 1
- external trade 1
- extra kinetic energy 1
- extra payment 2
- extra-class work 1
- extra-curricular work 1
- extra-school education 1
- extra-scientific knowledge 1
- extraction 1
- extraction of REM 1
- extraction treatment 1
- extractive methods 1
- extractive substances 1
- extracurricular activities 1
- extracurricular activities 6
- extracurricular activities, 1
- extracurricular classes 3
- extracurricular education 2
- extracurricular educational work 2
- extracurricular institution 2