1  2  3  4

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4  _  _  _  _


ACROSS
1)  the men and women who man a vehicle (ship, aircraft, etc.)
2)  lacking companions or companionship
3)  a condition (mostly in boys) characterized by behavioral and learning disorders
4)  a serious (sometimes fatal) infection of rodents caused by yersinia ____is and accidentally transmitted to humans by the bite of a flea that has bitten an infected animal


DOWN
1)  a sudden very loud noise
2)  sit and travel on the back of animal, usually while controlling its motions
3)  either extremity of something that has length
4)  the countries of (originally) europe and (now including) north america and south america

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