\section{Internal Formats in Yosys}
-Yosys uses two different internal formats. The first is used to store an abstract syntax tree (AST) of a verilog
+Yosys uses two different internal formats. The first is used to store an abstract syntax tree (AST) of a Verilog
input file. This format is simply called {\it AST} and is generated by the Verilog Frontend. This data structure
is consumed by a subsystem called {\it AST Frontend}\footnote{In Yosys the term {\it pass} is only used to
refer to commands that operate on the RTLIL data structure.}. This AST Frontend then generates a design in Yosys'
described by the Liberty file \citeweblink{LibertyFormat} {\tt cells.lib}:
\begin{lstlisting}[language=sh,numbers=left,frame=single]
-# read input file tpo internal representation
+# read input file to internal representation
read_verilog design.v
# convert high-level behavioral parts ("processes") to d-type flip-flops and muxes