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ACROSS
1)  any small rounded protuberance (as on certain plants or animals)
2)  an elaborate song for solo voice
3)  a worker (especially in an office) hired on a ____orary basis
4)  a hard grey lustrous metallic element that is highly resistant to corrosion; occurs in niobite and fergusonite and tantalite


DOWN
1)  a unit of power equal to 1 joule per second; the power dissipated by a current of 1 ampere flowing across a resistance of 1 ohm
2)  a particular geographical region of indefinite boundary (usually serving some special purpose or distinguished by its people or culture or geography)
3)  the shape of a raised edge of a more or less circular object
4)  (military) signal to turn the lights out

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