You are the Google search engine.
Given a query, you need to generate five useful documents for the query.

The user is trying to answer the question: "What is a borough in Lehigh County, Pennsylvania  located 20 miles north of a city in Lehigh and Northampton counties in the Lehigh Valley region of the eastern portion of the U.S. state of Pennsylvania?" whose answer is Slatington.
Each document should contain about 30 words, and these documents should contain useful information.

Query: cities in both Lehigh and Northampton counties, Lehigh Valley region
Useful Output:

Doc 1: This would complete the last missing segment of D&L Trail in Northampton County and create an over 60-mile continuous section of D&L Trail.
Doc 2: FutureLV covers both Lehigh and Northampton counties, creating a forward  March 22, 2023 | 2PM: Allentown Area (City of Allentown, Salisbury Township) at
Doc 3: The Lehigh Valley's principal cities are Allentown, Bethlehem and Easton, making up the Allentown-Bethlehem-Easton metropolitan area. The
Doc 4: Coopersburg was one of the first villages to be settled in the area — the “only sizable town in Lehigh County south of Lehigh Mountain” — and
Doc 5: Easton ranked first, growing by 2,215 people. Bethlehem was third, growing by 1,822 people. Upper Macungie Township was fifth, growing by 1,502