A key to understand the VMS

[Torsten]

I suspect that such a plot for a longer piece of text in Pinyin (either with or without the numerical tone indicators)
might turn out very similar.

I have calculated similar graphs for a text in Pinyin with 13 340 words and 3020 word types. The source for the text is You are not allowed to view links. Register or Login to view.
In Pinyin many smaller networks build a larger network. The reason for this is the use of many short words. It seems that the large uniform network of similar words for the VMS is unique.

   

An enlarged part of the graph for Pinyin: