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\documentclass{article}
\usepackage{tikz}
\usetikzlibrary{shapes,arrows,shadows}
\usepackage{amsmath,bm,times}
\newcommand{\mx}[1]{\mathbf{\bm{#1}}} % Matrix command
\newcommand{\vc}[1]{\mathbf{\bm{#1}}} % Vector command
\begin{document}
% Define the layers to draw the diagram
\pgfdeclarelayer{background}
\pgfdeclarelayer{foreground}
\pgfsetlayers{background,main,foreground}
% Define block styles used later
\tikzstyle{sensor}=[draw, fill=blue!20, text width=5em,
text centered, minimum height=2.5em,drop shadow]
\tikzstyle{ann} = [above, text width=5em, text centered]
\tikzstyle{wa} = [sensor, text width=10em, fill=red!20,
minimum height=6em, rounded corners, drop shadow]
\tikzstyle{wa2} = [sensor, text width=10em, fill=blue!20,
minimum height=6em, rounded corners, drop shadow]
\tikzstyle{wa3} = [sensor, text width=10em, fill=green!20,
minimum height=6em, rounded corners, drop shadow]
\tikzstyle{wa4} = [sensor, text width=10em, fill=yellow!20,
minimum height=6em, rounded corners, drop shadow]
\tikzstyle{wa5} = [sensor, text width=10em, fill=orange!20,
minimum height=6em, rounded corners, drop shadow]
\tikzstyle{sc} = [sensor, text width=13em, fill=red!20,
minimum height=10em, rounded corners, drop shadow]
% Define distances for bordering
\def\blockdist{2.3}
\def\edgedist{2.5}
\begin{tikzpicture}
\node (n1) [wa] {$Main$ $Loop$};
\path (n1)+(-4,-4) node (n2)[wa2] {$Target$ $Database$};
\path (n1)+(0,- 8) node (n3) [wa3] {$Target$ $Software$};
\path (n1)+(5,-6) node (n4) [wa4] {$C$ $Parser$ $Script$};
\path (n1)+(5,-2.5) node (n5) [wa5] {$Analyzer$};
\path [draw, ->] (n1.west) -| (n2.north) {} node [xshift=-60,yshift=40] {$Injects$ $SQL$ $Statement$};
\path [draw, ->] (n3.west) -| (n2.south) {} node [xshift=-30,yshift=-40]{$Runs$ $over$};
\path [draw, ->] (n3.east) -| (n4.south) {} node [yshift=-40] {$Returns$ $output$};
\path [draw, ->] (n4.north) -- (n5.south) {} node [xshift=50,yshift=-20] {$Gives$ $score$};
\path [draw, ->] (n5.north) |- (n1.east) node [xshift=90,yshift=20]{$Generates$ $human$ $readable$ $report$ $file$} {} ;
\end{tikzpicture}
\end{document}
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