Anchor: Problems are distinguished from failures of code, which represent defects discovered during operation.
Entailed: Failures of code found during execution are called problems.
Contradiction: Problems and failures of code refer to the same thing.
Contradiction: Only a few dozen people live here.
Contradiction: Critics used the re-issue to write positively of the author. 
Contradiction: A man is on the bus frowning at the people
Contradiction: young people having a drink at a club