question about A Design Methodology for Switched-Capacitor DC-DC Converters

[blade150]

Dear all

I am reading the paper about switched capacitor <A Design Methodology for Switched-Capacitor DC-DC Converters> by Michael Douglas Seeman
question about
Appendix A
Network-Theory-Based Analysis for Switched-Capacitor Converters

The question is how to get the matrix in the red circle in the figure below?

 

[tepalia02]

Looks like it is written in Ax=b format.

Matrix Equations

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