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\PYG{g+gp}{\PYGZgt{}\PYGZgt{}\PYGZgt{} }\PYG{n}{counts}\PYG{p}{[}\PYG{l+s+s1}{\PYGZsq{}A\PYGZsq{}}\PYG{p}{,} \PYG{l+s+s1}{\PYGZsq{}C\PYGZsq{}}\PYG{p}{]} \PYG{o}{=} \PYG{l+m+mf}{12.0}
\PYG{g+gp}{\PYGZgt{}\PYGZgt{}\PYGZgt{} }\PYG{n}{counts}\PYG{p}{[}\PYG{l+m+mi}{2}\PYG{p}{,} \PYG{l+m+mi}{1}\PYG{p}{]} \PYG{o}{=} \PYG{l+m+mf}{5.0}
\PYG{g+gp}{\PYGZgt{}\PYGZgt{}\PYGZgt{} }\PYG{n}{counts}\PYG{p}{[}\PYG{l+m+mi}{3}\PYG{p}{,} \PYG{l+s+s1}{\PYGZsq{}T\PYGZsq{}}\PYG{p}{]} \PYG{o}{=} \PYG{o}{\PYGZhy{}}\PYG{l+m+mi}{2}
\end{Verbatim}
