This is represented as follows:
$$
\begin{array}{ccccccccc}
\textcolor{red}{\blacksquare} & \textcolor{red}{\blacksquare} & \textcolor{red}{\blacksquare} & \textcolor{red}{\blacksquare} & \textcolor{red}{\blacksquare} & \textcolor{red}{\blacksquare} &
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