Means
These issues [..] are rich enough that we will devote Chapter 20 to a more detailed study of the small-world phenomenon and its consequences.
they are so rich that ....? Right. ] are rich enough that we devote He had the option and rejected it: a style choice.
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soheil1Meansas a consequence of their being rich?they are so rich that ....?Right.
soheil1why did he not say:These issues [..] are rich enough that we devoteHe had the option and rejected it: a style choice.