[Haskell-beginners] flatten comma operator

[Kees Bleijenberg]

In 'Real World Haskell' I found code like LiftA2 (,) ....
Looks odd. But after some experimenting in winghci I found that (,) 1 2 is
valid code and is equal to (1,2).
Now I wonder how to create (1,2,3).  I think you need a join or a flatten
function or ...? Join doesn't work?
 
Kees
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