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2  _  _  _  _

3  _  _  _  _

4  _  _  _  _


ACROSS
1)  a diagrammatic representation of the earth's surface (or part of it)
2)  the chief ____utive department of the united states government
3)  primitive chlorophyll-containing mainly aquatic eukaryotic organisms lacking true stems and roots and leaves
4)  a structure in which animals lay eggs or give birth to their young


DOWN
1)  an average of n numbers computed by adding some function of the numbers and dividing by some function of n
2)  a shaft on which a wheel rotates
3)  a wooden pin pushed or driven into a surface
4)  singing jazz; the singer substitutes nonsense syllables for the words of the song and tries to sound like a musical instrument

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