Anchor: The real and obvious source is the good fortune of being the pre-eminent operating system on IBM PCs.
Entailed: It wasn't luck but the fact that they were the dominant OS on PCs.
Contradiction: Most IBM computers came with LINUX loaded on them.
Contradiction: I think the Constitution outlaws representing yourself. 
Contradiction: A person is sculpting something.
Contradiction: A runner passes another runner in a race.
Contradiction: All electricity here was d.c., making a.c. devices useless.