I have a question about the "Decoding in Action" section in Lecture 2.

[kimsooseong1234]

Thank you for your explanation of the decoding graph. However, I have a question about it.

Looking at the decoding graph image, the leftmost node is connected to the bulk node to its right. This indicates that the error is trustworthy, and we can tell that an error occurred at the rightmost bit of the string. However, because the condition left_boundary_paired = True is set, the decoder suddenly flips the first bit of the string — which actually had no error. Why does this happen? We clearly know that the logical value is '1', and we also know that the error occurred at the last bit of the string, so why does this happen?