%%%------------------------------------------------------------------------------------------------------------
\begin{tikzpicture}
\begin{scope}[xshift=0.6in]
\setcounter{mycount1}{1}
\draw[step=0.5cm,color=orange,thick] (-1,-0.5) grid (1,0.5);
\foreach \y in {+0.25,-0.25}
  \foreach \x in {-0.75,-0.25,0.25,0.75}{
    \node [fill=orange!20,inner sep=0pt,minimum height=0.49cm,minimum width=0.49cm] at (\x,\y) {$\number\value{mycount1}$};
    \addtocounter{mycount1}{1};
  }
\node [anchor=south] (varlabel) at (0,0.6) {$\textbf{s}$};
\node [anchor=north] (labelc) at (0,-0.7) {\footnotesize{(a)}};
\end{scope}

\begin{scope}[xshift=2.1in]
\setcounter{mycount1}{1}
\draw[step=0.5cm,color=ugreen,thick] (-1,-0.5) grid (1,0);
\foreach \y in {-0.25}
  \foreach \x in {-0.75,-0.25,0.25,0.75}{
    \node [fill=green!20,inner sep=0pt,minimum height=0.48cm,minimum width=0.48cm] at (\x,\y) {$1$};
    \addtocounter{mycount1}{1};
  }
\node [anchor=south] (varlabel) at (0,0.1) {$\textbf{b}$};
\node [anchor=north] (labelc) at (0,-0.7) {\footnotesize{(b)}};
\end{scope}



\begin{scope}[yshift=-1in]
\setcounter{mycount1}{1}
\draw[step=0.5cm,color=orange,thick] (-1,-0.5) grid (1,0.5);
\foreach \y in {+0.25,-0.25}
  \foreach \x in {-0.75,-0.25,0.25,0.75}{
    \node [fill=orange!20,inner sep=0pt,minimum height=0.49cm,minimum width=0.49cm] at (\x,\y) {$\number\value{mycount1}$};
    \addtocounter{mycount1}{1};
  }
\node [anchor=south] (varlabel) at (0,0.6) {$\textbf{s}$};
\end{scope}
\begin{scope}[yshift=-1in,xshift=1.5in]
\setcounter{mycount1}{1}
\draw[step=0.5cm,color=ugreen,thick] (-1,-0.5) grid (1,0.5);
\foreach \y in {+0.25}
  \foreach \x in {-0.75,-0.25,0.25,0.75}{
    \node [fill=green!20,inner sep=0pt,minimum height=0.49cm,minimum width=0.49cm] at (\x,\y) {$1$};
    \addtocounter{mycount1}{1};
  }
  \foreach \y in {-0.25}
  \foreach \x in {-0.75,-0.25,0.25,0.75}{
    \node [fill=purple!20,inner sep=0pt,minimum height=0.49cm,minimum width=0.49cm] at (\x,\y) {$1$};
    \addtocounter{mycount1}{1};
  }
\node [anchor=center] (plabel) at (-4.5em,0) {\huge{$\textbf{+}$}};
\node [anchor=south] (varlabel) at (0,0.6) {$\textbf{b}$};
\node [anchor=north] (labelc) at (0,-0.7) {\footnotesize{(c)}};
\end{scope}
\begin{scope}[yshift=-1in,xshift=3in]
\setcounter{mycount1}{2}
\draw[step=0.5cm,color=orange,thick] (-1,-0.5) grid (1,0.5);
\foreach \y in {+0.25,-0.25}
  \foreach \x in {-0.75,-0.25,0.25,0.75}{
    \node [fill=orange!20,inner sep=0pt,minimum height=0.49cm,minimum width=0.49cm] at (\x,\y) {$\number\value{mycount1}$};
    \addtocounter{mycount1}{1};
  }
\node [anchor=center] (plabel) at (-4.5em,0) {\huge{$\textbf{=}$}};
\node [anchor=south] (varlabel) at (0,0.6) {$\textbf{s+b}$};
\end{scope}


\end{tikzpicture}
%%%------------------------------------------------------------------------------------------------------------

