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Grammars are straightforward:

`V(label)` is a sub-procedure call.
the key-value pairs are respectively sub-procedure names and definition.

Each grammar is self-contained. If a grammar has a sub grammar, the
`V()` calls do not cross the parent-child boundaries.

Groups are a bit more complex, and behave differently according to the
capture that surrounds them, if any. No time now, more on this later.

-- Pierre-Yves