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4  _  _  _  _


ACROSS
1)  a landlocked republic in northwestern africa; achieved independence from france in 1960; ____ was a center of west african civilization for more than 4,000 years
2)  in or relating to or obtained from urine
3)  the periodic rise and fall of the sea level under the gravitational pull of the moon
4)  a hard grey lustrous metallic element that is highly resistant to corrosion; occurs in niobite and fergusonite and tantalite


DOWN
1)  an inferior dog or one of mixed breed
2)  an elaborate song for solo voice
3)  either of two folds of skin that can be moved to cover or open the eye
4)  water frozen in the solid state

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mali
uric
tide
tass