Introduction to the C4 Reference Books
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It is not my intention to be definitive or encyclopedic about just what is on the C4 "list". When in doubt, I have attempted to err on the side of inclusiveness. However, I have omitted calls that are clearly no longer in serious use.
Some calls are nevertheless sufficiently obscure that one might question the usefulness of including them, particularly for people learning C4. I have listed their names in italics while the "mainstream" C4 calls are in bold face. Whether I have judged wisely is open to debate.
These books contain many examples. They are sometimes intentionally very difficult. For example, in the descriptions of concepts, the example calls are sometimes very complex, for the purpose of showing that the working of the concept is independent of the complexity of the underlying call. In any case, the examples are intended as manual or mental checker-pushing exercises. Don't bother checking them by computer — they work.