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ACROSS
1)  a motor vehicle with four wheels; usually propelled by an internal combustion engine
2)  the cardinal number that is the sum of one and one and one
3)  a european river; flows into the baltic sea
4)  a necessary or essential thing


DOWN
1)  (physics and chemistry) the smallest component of an element having the chemical properties of the element
2)  the official literary language of pakistan, closely related to hindi; widely used in india (mostly by moslems); written in arabic script
3)  neckwear consisting of a long narrow piece of material worn (mostly by men) under a collar and tied in knot at the front
4)  dutch astronomer who proved that the galaxy is rotating and proposed the existence of the ____ cloud (1900-1992)

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