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From: "Chris M. Thomasson" <chris.m.thomasson.1@gmail.com>
Newsgroups: sci.math
Subject: Re: Does the number of nines increase?
Date: Wed, 10 Jul 2024 17:41:18 -0700
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On 7/10/2024 5:32 PM, Ben Bacarisse wrote:
> "Chris M. Thomasson" <chris.m.thomasson.1@gmail.com> writes:
[...]
> For example, with these tiles, the sequence 1, 2, 1, 3 produces


> 
>    aa    bb    aa    abb
>    aab   ba    aab    b

r[0] = aa
r[1] = bb
r[3] = abb
r[4] = aab
r[5] = ba
r[6] = b

Where:

r[0]  r[1]  r[0]  r[3]
r[4]  r[5]  r[4]  r[6]


Is a legit mapping?


> 
> with top string aabbaaabb = bottom string aabbaaabb.  So for this input,
> the program should print "yes".  You don't need to give the sequence
> that gives the matching top and bottom strings (though that would be a
> neat extra), you just have print yes or no depending on whether such a
> sequence of tiles exists or not.
>