Assertion: gopher's mound | /r/HasProperty | every 4 to 5 feet
Facets:
Source sentences:
text: While there are recorded instances of gophers digging as much as 300 feet (100 meters) of tunnels in a single day, most of the time gophers only dig about 15 feet (5 meters) per day, with fresh mounds every 4 to 5 feet (about every 1.5 meters).