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I wish to draw the following diagram, but I do not know how to draw it correctly, may you please help me Diagram in Special shape

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enter image description here

\documentclass{article}
\usepackage{tikz-cd}
\usepackage{amsmath}
\begin{document}
\[
\begin{tikzcd}[row sep=1.4cm,column sep=1.4cm]
D_1\arrow[r,"\varepsilon_1"] \arrow[dr,swap,"\forall\delta_1"]& D_1*D_2
\arrow[d,"\exists!f"] & 
\arrow[l,"\varepsilon_1",swap] \arrow[dl,"\forall\delta_2"]D_2\\
&  D& 
\end{tikzcd}
\]
\end{document}
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  • I’d increase the row sep, would you try? – egreg Apr 21 '18 at 13:02
  • @egreg Again, you're right. Done. ;-) – user121799 Apr 21 '18 at 15:26

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