1  2  3 

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2  _  _  _

3  _  _  _


ACROSS
1)  black tropical american cuckoo
2)  a sheath worn to protect a finger
3)  a rapid automatic system to detect plastic explosives in passengers' luggage using x-ray technology and computers; designed for use in airports


DOWN
1)  the smallest whole number or a numeral representing this number
2)  a sign of assent or salutation or command
3)  the branch of engineering that deals with the use of computers and telecommunications to retrieve and store and transmit information

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