Question: What shares a border with the county where Greenleaf is located?

full_context: Document 1: Palmer, Kansas: Palmer is a city in Washington County, Kansas, United States. As of the 2010 census, the city population was 111.
Document 2: Lanham, Kansas and Nebraska: Lanham is an unincorporated community in both Washington County, Kansas and Gage County, Nebraska in the United States. It is located along State Line Road just west of K-148/Nebraska Highway 112. Its main street forms the state line.
Document 3: Washington, Kansas: Washington is a city in, and the county seat of, Washington County, Kansas, United States. As of the 2010 census, the city population was 1,131.
Document 4: Circle of latitude: 40 ° N In the USA, the border between Nebraska and Kansas. The parallel was originally chosen for the Mason -- Dixon line, but the line was moved several miles south to avoid bisecting the city of Philadelphia.
Document 5: K-8 (Kansas highway): K-8 is the name of two separate state highways in Kansas, United States. The southern highway is a road, linking Oklahoma State Highway 8 (SH-8) to the town of Kiowa. The northern highway links U.S. Route 36 (US-36) near Athol to Nebraska Highway 10 (N-10) near the town of Franklin.
Document 6: Barnes, Kansas: Barnes is a city in Washington County, Kansas, United States. As of the 2010 census, the city population was 159.
Document 7: Garfield, Kansas: Garfield is a city in Pawnee County, Kansas, United States. As of the 2010 census, the city population was 190.
Document 8: Greene, Iowa: Greene is a city in Butler County, Iowa, along the Shell Rock River, and along Butler County's northern border, where Butler and Floyd counties meet. The population was 1,130 at the 2010 census. Greene is the headquarters of the Iowa Northern Railway.
Document 9: Geographic center of the United States: Its position as located in a 1918 survey is located at 39 ° 50 ′ N 98 ° 35 ′ W ﻿ / ﻿ 39.833 ° N 98.583 ° W ﻿ / 39.833; - 98.583 ﻿ (Geographic Center of the Contiguous United States), about 2.6 miles (4.2 km) northwest of the center of Lebanon, Kansas, approximately 12 miles (19 km) south of the Kansas - Nebraska border.
Document 10: Linn, Kansas: Linn is a city in Washington County, Kansas, United States. As of the 2010 census, the city population was 410.
Document 11: Washington Township, Harlan County, Nebraska: Washington Township is one of sixteen townships in Harlan County, Nebraska, United States. The population was 66 at the 2000 census. A 2006 estimate placed the township's population at 61.
Document 12: Stateline Township, Sherman County, Kansas: Stateline Township is one of the thirteen townships of Sherman County, Kansas, United States. The population was 344 at the 2000 census.
Document 13: Greenleaf, Kansas: Greenleaf is a city in Washington County, Kansas, United States. As of the 2010 census, the city population was 331.
Document 14: Lanham, Maryland: Lanham is an unincorporated community and census-designated place in Prince George's County, Maryland. As of the 2010 United States Census it had a population of 10,157. The New Carrollton station (the terminus of the Washington Metro's Orange Line) as well as an Amtrak station are across the Capital Beltway in New Carrollton, Maryland. Doctors Community Hospital is located in Lanham.
Document 15: Greenleaf, Wisconsin: Greenleaf is an unincorporated census-designated place in Brown County, Wisconsin, United States, in the town of Wrightstown. As of the 2010 census it had a population of 607. Greenleaf was named for Emery B. Greenleaf, the general manager of the Milwaukee & Northern railroad at the time the Greenleaf post office was established in 1873.
ground_truth: Gage County
sub_queries: Greenleaf >> located in the administrative territorial entity Answer: Washington County
Washington County >> shares border with Answer: Gage County