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> > string.lower "HELLO".."WORLD"
> I reckon it is ambiguous, but still not much more than math.exp (3)*(4)

The point here is not that
	string.lower "HELLO".."WORLD"
	math.exp (3)*(4)
are ambiguous: it's that they are *expressions*, not statements. And the
only expression that is a statement is a function call, which neither is
(one is a concatenation, the other a multiplication).