It seems to work, until Dr . Hill, concerned about southern California, observes a river flowing backwards, draining into the open fault.
2.
The path continues uphill towards the " Teufelskamin " ( " Devil's Chimney " ), an open fault in the Bunter sandstone that appears as a 20-metre-deep cave.
3.
A pattern set with 100 % stuck-at fault coverage consists of tests to detect every possible stuck-at fault in a circuit . 100 % stuck-at fault coverage does not necessarily guarantee high quality, since faults of many other kinds often occur ( e . g . bridging faults, opens faults, delay faults ).