diff --git a/Documents/LaTeX/considerations.tex b/Documents/LaTeX/considerations.tex
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--- a/Documents/LaTeX/considerations.tex
+++ b/Documents/LaTeX/considerations.tex
@@ -54,5 +54,6 @@ All machines in the process flow has effects while dealing with the structures o
 \subsection{Four-terminal Sensing}
 
 \input{schematic_4terminal.tex}
+\input{principle_rsquare.tex}
 
 \clearpage
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