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ACROSS
1)  an area in a town where a public mercantile establishment is set up
2)  an elaborate song for solo voice
3)  perceive by sight or have the power to perceive by sight
4)  united states virologist who developed the ____ vaccine that is injected against poliomyelitis (born 1914)


DOWN
1)  the property of a body that causes it to have weight in a gravitational field
2)  a particular geographical region of indefinite boundary (usually serving some special purpose or distinguished by its people or culture or geography)
3)  the basic unit of money in cambodia; equal to 100 sen
4)  an enclosed armored military vehicle; has a cannon and moves on caterpillar treads

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