Anchor: A problem could be any anomaly discovered during design, coding, testing, or implementation.
Entailed: Problems can be found during different phases of the software development life cycle.
Contradiction: Problems can only be found during the design and coding phases.
Contradiction: When we looked out the window, we could only see a cat.
Contradiction: There are a number of obelisks and pylons.
Contradiction: Three girls are playing tennis.
Contradiction: Customers may make agreements to prepare mail.