1  2  3

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ACROSS
1)  an agency in the department of justice that enforces laws and regulations for the admission of foreign-born persons to the united states
2)  the former capital and 2nd largest city of brazil; chief brazilian port; famous as a tourist attraction
3)  a highly unstable radioactive element (the heaviest of the halogen series); a decay product of uranium and thorium


DOWN
1)  a militant organization of irish nationalists who used terrorism and guerilla warfare in an effort to drive british forces from northern ireland and achieve a united independent ireland
2)  a luminance u___ equal to 1 candle per square meter measured perpendicular to the rays from the source
3)  an internationally recognized distress signal in radio code

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