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1.
Colorado borders South Dakota
2.
Alabama borders South Carolina
3.
Maryland borders New York
4.
Iowa borders South Dakota
5.
Colorado borders Kansas
6.
Missouri borders Tennessee
7.
Kentucky borders North Carolina
8.
Arkansas borders Texas
9.
Alaska borders no other U.S. state
10.
Virginia borders Maryland
12.
Connecticut borders New Jersey
13.
Kentucky borders Ohio
14.
Louisiana borders Mississippi
15.
Maine borders Vermont