Insertions are considered one of the most complex topics in TEX. Many users master topics such as tokens, file I/O, macros, and even OTRs before they dare tackle insertions. The reason is that insertions are complex, and although The TEXbook does cover all the relevant material, it is somewhat cryptic regarding insertions and lacks simple examples. The main discussion of insertions takes place on [115–125], where TEX’s registers are also discussed. Examples of insertions are shown, mostly without explanations, on [363–364, 423–424]. Therefore, this chapter is definitely needed. It tries to explain insertions in detail and shows specific, simple examples. Concepts are developed gradually, and the ultimate truth is revealed in steps.
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