\ifx\JPicScale\undefined\def\JPicScale{1}\fi
\psset{unit=\JPicScale mm}
\psset{linewidth=0.3,dotsep=1,hatchwidth=0.3,hatchsep=1.5,shadowsize=1,dimen=middle}
\psset{dotsize=0.7 2.5,dotscale=1 1,fillcolor=black}
\psset{arrowsize=1 2,arrowlength=1,arrowinset=0.25,tbarsize=0.7 5,bracketlength=0.15,rbracketlength=0.15}
\begin{center}
\begin{pspicture}(0,0)(73.54,40)
\rput{0}(10,0){\psellipse[linewidth=0.75](0,0)(3.54,3.54)}
\rput{0}(30,0){\psellipse[linewidth=0.75](0,0)(3.54,3.54)}
\rput{0}(50,0){\psellipse[linewidth=0.75](0,0)(3.54,3.54)}
\rput{0}(70,0){\psellipse[linewidth=0.75](0,0)(3.54,3.54)}
\rput{0}(10,0){\small 1}
\rput{0}(30,0){\small 2}
\rput{0}(50,0){\small 3}
\rput{0}(70,0){\small 4}
\pspolygon[linewidth=0.75](10,40)(15,40)(15,35)(10,35)
\pspolygon[linewidth=0.75](37.63,39.74)(42.63,39.74)(42.63,34.74)(37.63,34.74)
\pspolygon[linewidth=0.75](64.87,39.74)(69.87,39.74)(69.87,34.74)(64.87,34.74)
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\rput{0}(67.37,37.24){\small 3}
\psline[linewidth=0.75](6.05,-0.04)(10,35)
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\psbezier(10,35)(10,35)(10,35)(10,35)
\psline(8.42,3.12)(8.16,3.12)
\psline[linewidth=0.75](12.5,34.96)(8.82,3.16)
\psline[linewidth=0.75](14.87,34.34)(26.32,0)
\psline(26.32,0)(26.32,-0.26)
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\psline[linewidth=0.75](28.42,3.03)(38.95,34.34)
\psline[linewidth=0.75](30,3.55)(40.39,34.61)
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\psline[linewidth=0.75](32.11,2.63)(64.74,34.74)
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\end{pspicture}
\end{center}

\bs
{\small{\bf Fig 2}\pointir \it Labelled diagram of format $3\times 4$ corresponding to the one of Fig 1.}


