[Retros] At-home initial array challenge

[Noam Elkies]

I wrote:


>> I was lucky -- the third thing I tried worked [...]


Francois Labelle responded:


> Congratulations! [...]


Thanks! :-)


>> P.S. Clearly it couldn't have been in 6.5 or 7.0 moves...



> I suspected that something like that was true, but was afraid

> to get it wrong which would have inadvertently added a hint.



> (16+x) type can only be of length odd.5 or even.0

> (x+16) type can only be of length even.0 or even.5



> So clearly length odd.0 is impossible, but how can you dismiss

> length 6.5 quickly? I think that you got it wrong!


Indeed I did, sorry.  At any rate 7.0 is impossible.

NDE