IPv6 OSPF Summarisation

I came up with a different solution for this task,

area 58 range fc00:1::/57

but the solution guide states the answer is

area 58 range fc00:1::/56


I have sat and worked it out 3 times now and I'm confident in my answer, can someone please confirm for me?

As far as I can see there isn't  128 in 88, as shown in the Solutions Guide

88 = 0000 0000 1000 1000







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