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ACROSS
1)  the use of nuclear magnetic resonance of protons to produce proton density images
2)  a fractional monetary unit of japan and indonesia and cambodia; equal to one hundredth of a yen or rupiah or riel
3)  a navigational system involving satellites and computers that can determine the latitude and longitude of a receiver on earth by computing the time difference for signals from different satellites to reach the receiver


DOWN
1)  white crystalline compound used as a food additive to enhance flavor; often used in chinese cooking
2)  informal abbreviation of `___resentative'
3)  an agency in the department of justice that enforces laws and regulations for the admission of foreign-born persons to the united states

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