twoway classification

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airspace Class D — Airspace in which both IFR (instrument flight rules) and VFR (visual flight rules) flights are permitted and are subject to air traffic control service in this airspace. IFR flights are separated from other IFR flights and receive traffic… … Aviation dictionary
ECONOMIC HISTORY — This article is arranged according to the following outline: first temple period exile and restoration second temple period talmudic era muslim middle ages medieval christendom economic doctrines early modern period sephardim and ashkenazim… … Encyclopedia of Judaism

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