Task 6.3 OSPFv3 Summarization

I am supposed to summary the following IPv6 addresses with the least amount of overlap possible. (I take this to mean the most specific summarization possible).

2001:141:1:12::/64
2001:141:1:25::/64

so taking the 4th grouping 12 & 15. I write them in binary like this:
0000 0000 0000 1100 = 12
0000 0000 0001 1001 = 25
------------------------
XXXX XXXX XXX <--- Mask<br />
I come up with 11 bits for the mask.

So in total my mask should be /59... but the solutions guide says /58. Who is correct and why?
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