Question: What county shares a border with another county, that in turn borders a third county, where the community of Eagle Rock is found?

full_context: Document 1: Southwest City, Missouri: Southwest City is a city in McDonald County, Missouri, United States. The population was 937 at the 2010 census, at which time it was a town. It is part of the Fayetteville–Springdale–Rogers, AR-MO Metropolitan Statistical Area and is located in the southwestern corner of the state of Missouri.
Document 2: Eagle Rock, Missouri: Eagle Rock is an unincorporated community and census-designated place in Barry County, Missouri, United States. As of the 2010 census it had a population of 199.
Document 3: Oak Grove, Sumner County, Tennessee: Oak Grove is a census-designated place and unincorporated community in Sumner County, Tennessee, United States. Its population was 231 as of the 2010 census.
Document 4: Sugar Creek Township, Barry County, Missouri: Sugar Creek Township is one of twenty-five townships in Barry County, Missouri, United States. As of the 2000 census, its population was 1,969.
Document 5: Ozark Township, Barry County, Missouri: Ozark Township is one of twenty-five townships in Barry County, Missouri, United States. As of the 2000 census, its population was 879.
Document 6: Crane Creek Township, Barry County, Missouri: Crane Creek Township is one of twenty-five townships in Barry County, Missouri, United States. As of the 2000 census, its population was 923.
Document 7: Flat Creek Township, Barry County, Missouri: Flat Creek Township is one of twenty-five townships in Barry County, Missouri, United States. As of the 2000 census, its population was 5,462.
Document 8: Union Township, Lawrence County, Ohio: Union Township is one of the fourteen townships of Lawrence County, Ohio, United States. The 2000 census recorded 9,002 people in the township, 7,540 of whom lived in the unincorporated portions of the township.
Document 9: Summertown, Tennessee: Summertown is an unincorporated community and census-designated place (CDP) in Lawrence County, Tennessee with a small portion in both Lewis County and Maury County. The population of Summertown was 866 at the 2010 census.
Document 10: Monett, Missouri: Monett is a city in Monett Township in Barry County and Pierce Township in Lawrence County, Missouri, United States. It is the most populous city in Barry and Lawrence counties, and the 83rd most populous in the State of Missouri. The city is located in the Ozarks, just south of Interstate 44 between Joplin and Springfield. The population was 8,873 at the 2010 census. The population was estimated to have been 9,118 in 2018.
Document 11: Sumner, Georgia: Sumner is a town in Worth County, Georgia, United States. The population was 309 at the 2000 census. It is part of the Albany, Georgia Metropolitan Statistical Area. Sumner High School is listed on the National Register of Historic Places.
Document 12: List of municipalities in Tennessee: Tennessee is a state located in the Southern United States. There are 346 municipalities in the state of Tennessee. Municipalities in the state are designated as ``cities ''or`` towns''. As of the 2010 U.S. Census, 3,564,494 Tennesseans, or just over 56% of the state's total population of 6,346,105, resided in municipalities. The remainder resided in unincorporated areas.
Document 13: Brinkley, Arkansas: Brinkley is the most populous city in Monroe County, Arkansas, United States. Located within the Arkansas Delta, Brinkley was founded as a railroad town in 1872. The city has historically been a transportation and agricultural center in the region, more recently developing a reputation for outdoors recreation and the ivory-billed woodpecker. Birding has become important to the city and region following the discovery of the ivory-billed woodpecker in 2004, a species thought to be extinct 60 years earlier. Located halfway between Little Rock and Memphis, Tennessee, the city has used the slogan "We'll Meet You Half-Way" in some of its advertising campaigns. The population was 3,188 at the 2010 census.
Document 14: Monowi, Nebraska: Monowi ( ) is an incorporated village in Boyd County, Nebraska, United States. According to the 2010 census, it has a population of 1. It is the only incorporated municipality in the United States with such a population. The sole resident is the mayor as well as librarian and bartender.
Document 15: Monark Springs, Missouri: Monark Springs is a ghost town in Newton County, Missouri, United States. It is located approximately five miles east of Neosho.
ground_truth: Maury County
sub_queries: Eagle Rock >> located in the administrative territorial entity Answer: Barry County
Barry County >> shares border with Answer: Lawrence County
Lawrence County >> shares border with Answer: Maury County