some questions in the paper.

[tanger-code]

Hi, I'm looking at your paper, but there are some questions I don't understand.

In the step 5, Svtig2 is aligned to the s6 and s7 nodes, but why is SVtig2.1 >s6, SVtig 2.2 >s8 shown in Alignments？And why not use 'SVtig 2 >s6>s7' as the SVtig1 shown?

Can you help me explain it, thank you.