1 \documentclass[tikz
]{standalone
}
6 color=
{black!
20,black!
40,black!
60,black!
80},
13 25/
\textcolor{black
}{UI
},
14 25/
\textcolor{black
}{Tasks
},
15 25/
\textcolor{white
}{UoD
},
16 25/
\textcolor{white
}{SDSs
}
18 \node [draw,fill=white,circle
]{Types
};