1  2  3 

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3  _  _  _


ACROSS
1)  an informal debt instrument; representing `i owe you'
2)  a rapid automatic system to detect plastic explosives in passengers' luggage using x-ray technology and computers; designed for use in airports
3)  a doctor's degree in dental surgery


DOWN
1)  an explosive device that is improvised
2)  not divisible by two
3)  north american republic containing 50 states - 48 conterminous states in north america plus alaska in northwest north america and the hawaiian islands in the pacific ocean; achieved independence in 1776

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