For reasons unclear to me, (into {} ...) expects a sequence of 2-element 
*vectors*, not just 2-element collections. partition returns a seq of lists, 
not vectors, which is why you're getting that exception. You could try (into {} 
(map vec (partition 2 2 "12"))) instead.

On Mar 26, 2014, at 15:36 , Andy Smith <the4thamig...@googlemail.com> wrote:

> Hi all,
> 
> I was wondering why this doesn't create a map 1 -> 2 :
> 
> (into {} (partition 2 2 "12"))
> 
> Must be yet another misunderstanding of mine.
> 
> Thanks
> 
> Andy
> 
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