\documentclass{report}
\usepackage{pstricks}
\usepackage{pst-node, multido}

\begin{document}
 
\thispagestyle{empty} %no page number


\begin{figure}[th]
\begin{picture}(350,100)(-10,-30)
    \psset{nodesep=2pt,unit=1.2cm}
% The text
    \cnode(0,0){3pt}{t0}
%
    % --- repeat 1
    \cnode(0.5,-0.5){3pt}{t1}
    \cnode(1,0.3){3pt}{t2}
    \cnode(1.3,0){3pt}{t3}
    \cnode(1.7,-0.6){3pt}{t4}
    \cnode(2,1.1){3pt}{t5}
    % --- end of repeat
%
%Removed by me
%    \rput(3,1.8){the root}
%    \pcline{->}(3.3,1.6)(3.5,0.5)
    % --- repeat 2
    \cnode(2.5,-0.3){3pt}{t6}
    \cnode(3,0.6){3pt}{t7}
    \cnode(3.3,-0.4){3pt}{t8}
    \cnode(3.7,-0.5){3pt}{t9}
    \cnode(4,0.8){3pt}{t10}
    % --- end of repeat
%
    % --- repeat 3
    \cnode(4.5,-0.1){3pt}{t11}
    \cnode(5,0.7){3pt}{t12}
    \cnode(5.3,-0.5){3pt}{t13}
    \cnode(5.7,-0.7){3pt}{t14}
    \cnode(6,0.7){3pt}{t15}
    % --- end of repeat
%
    % --- repeat 4
    \cnode(6.5,-0.5){3pt}{t16}
 \cnode(7,0.8){3pt}{t17}
    \cnode(7.3,-0.7){3pt}{t18}
    \cnode(7.7,-0.7){3pt}{t19}
    \cnode(8,0.5){3pt}{t20}
    % --- end of repeat
%
    \cnode(8.6,0.7){3pt}{t21}
    \cnode(9,0.1){3pt}{t22}
    \cnode(9.5,0){3pt}{t23}
%    \cnode(10,0.3){3pt}{t24}
%    \cnode(10.4,0.5){3pt}{t25}
%
%    \cnode(11,1.2){3pt}{t26}
    \multido{\n=0+1,\i=1+1}{26}{\ncline[linestyle=dotted]{-}{t\n}{t\i}}
 
% The pattern
    \multido{\n=1+1,\r=0.5+2}{4}{\cnode*(\r,-0.3){3pt}{p\n1}}
    \multido{\n=1+1,\r=1+2}{4}{\cnode*(\r,0.6){3pt}{p\n2}}
    \multido{\n=1+1,\r=1.3+2}{4}{\cnode*(\r,-0.4){3pt}{p\n3}}
    \multido{\n=1+1,\r=1.7+2}{4}{\cnode*(\r,-0.5){3pt}{p\n4}}
    \multido{\n=1+1,\r=2+2}{4}{\cnode*(\r,0.8){3pt}{p\n5}}
    \multido{\n=1+1}{4}{
        \ncline{-}{p\n1}{p\n2}
        \ncline{-}{p\n2}{p\n3}
        \ncline{-}{p\n3}{p\n4}
        \ncline{-}{p\n4}{p\n5}
    }
 
\end{picture}
%\caption{Approximate Repetitions: White nodes represent the text
%$t$ and black nodes represent the string $\hat{t}$ (the repeated
%factor).}
\end{figure}

\end{document}