[r-t] Triples composition question

[Philip Earis]

Don:
> &3.1.7.1.4.3.4,1     Untitled Bob Triples
Just to make sure I understand correctly, in these place notations is "4" 
shorthand for "147"?”

Bingo.

Indeed, I'm a bit curious as to what else one might construe a "4" as? 
(Smiley thing).

No doubt I’ve overlooked some possible ambiguity which will soon be brought 
to my attention...  (another smiley thing)