tikzpicture ohne Farben; nur Grauschattierungen

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\begin{tikzpicture}
   \path (0,0) circle (2ex);
   \path[draw] (1,0) circle (2ex);
   \path[fill] (2,0) circle (2ex);
   \path[fill=yellow,draw=red] (3,0) circle (2ex);
   \path[clip] (4,0) circle (2ex);
   \fill[color=orange] (3.5,-.5) rectangle (4.5,.5);
\end{tikzpicture}
 
 
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\usepackage{amsmath,amssymb,amstext}
\usepackage{fontspec}
\usepackage{theorem}
\usepackage[english,main=ngerman]{babel}
\usepackage[autostyle,german=guillemets]{csquotes}
\usepackage{siunitx}
\sisetup{locale=DE,per-mode=fraction,separate-uncertainty}
\usepackage[autostyle,german=guillemets]{csquotes}
\usepackage{graphicx}
\usepackage{tikz}
\usepackage[ngerman]{varioref}
\theoremstyle{marginbreak}
\newtheorem{definition}{Definition}[chapter]
 
 
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