Missing non-breaking space in edge and node in Sec.4.2.2

[Antoine-Zimmermann]

The nodes and edges must contain names that are not breaking at the end of lines. There are missing no-break spaces in formal part of Sec.4.2.2:

Note, however, that axioms like – which given a graph such as sub-taxon ofHominini entails ...

this should be:

Note, however, that axioms like – which given a graph such as sub-taxon ofHominini entails ...