printing array of strings with writefln?

[Artem Tarasov via Digitalmars-d-learn]

writefln("%(%s-%)", ["a", "b", "c"]) doesn't print the intended 
a-b-c but surrounds each string with double quotes - "a"-"b"-"c", 
which I find inconsistent with the fact that writefln("%s", "a 
string") prints the string without any quotes.
How do I get the desired behaviour using just the format string?