New chapter finished

As promised before, after any major change I'll post new book preview. I just finished a chapter (*), and so you can download book preview featuring it at https://drive.google.com/open?id=1mO2i0H_xwsigFW_Md154YMf5wznBXurH.

Next, I plan on revising chapters already written. One that certainly has to be redone is Nineteen variant. Others might receive just slight polish, I hope, nothing major, although I cannot plan (*).

After that, I'll write small Python script to update text with commit-id and date of commit, instead of using only current date as an inaccurate book versioning.

After that still, work will resume on second to last chapter, Discovery variant. And after that, the last one. And after that still, the fabled, infamous Appendix. And, nothing more after that, as long as book is concerned (*).

(*) as it is always the case with iterative, exploratory -- in short, creative -- work, nothing is ever really done. But, that's for another post.