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Matrices!
\documentclass{article}
\usepackage{tikz}
\usetikzlibrary{matrix,arrows,positioning}
\begin{document}
\begin{table}
\centering%
\begin{tikzpicture}[scale=0.6,column 1/.style={nodes={text width=1.5cm}}]
\matrix[matrix of nodes,
draw,
%outer sep=2mm,
%...