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You're right. I'm very sorry.

Yesterday, I found some puzzle have multiple solution, so I'll update ASAP. 

Currently, 26, 27, and 2nd book's 4, 5 have multiple solution.

Thank you for your feedback, and again, I’m sorry for the confusion.

Thanks!!! This is my 1st puzzle book, so I'm really appreciate any comments or feedbacks.  If you enjoyed it, I’m very happy to hear that and if anything felt unfair, awkward, or confusing, please tell me!

Cool!