1  2  3 

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ACROSS
1)  an antiviral drug (trade name retrovir) used in the treatment of aids; adverse side effects include liver damage and suppression of the bone marrow
2)  the act of hauling something (as a vehicle) by means of a hitch or rope
3)  the sound made by a cow or bull


DOWN
1)  a unit of pressure: the pressure that will support a column of mercury 760 mm high at sea level and 0 degrees centigrade
2)  the facility where wild animals are housed for exhibition
3)  the cardinal number that is the sum of one and one or a numeral representing this number

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