15 \begin{tikzpicture}

    16 \node[circle,fill=black,inner sep=1pt] (A) at (1.73,0) {};

    17 \node[circle,fill=black,inner sep=1pt] (B) at (-1.73,0) {};

    18 \draw[dashed] (A) -- (B);

    19 \node[circle,fill=black,inner sep=1pt] (C) at (0,0) {};

    20 \node[circle,fill=black,inner sep=1pt] (D) at (0.8,0) {};

    21 \begin{scope}[yshift=-1cm]

    22 \path[clip] (0,0) circle (2);

    23 \begin{scope}[yshift=2cm]

    24 \draw (0,0) circle (2);

    25 \node[circle,fill=black,inner sep=1pt] (L2) at (-90:2) {};

    26 \node[circle,fill=black,inner sep=1pt] (L1) at (-120:2) {};

    27 \end{scope}

    28 \end{scope}

    29 \begin{scope}[yshift=1cm]

    30 \path[clip] (0,0) circle (2);

    31 \begin{scope}[yshift=-2cm]

    32 \draw (0,0) circle (2);

    33 \node[circle,fill=black,inner sep=1pt] (U) at (90:2) {};

    34 \end{scope}

    35 \end{scope}

    36 \begin{scope}

    37 \path[clip] (0,1) circle (2);

    38 \path[clip] (0,-1) circle (2);

    39 \foreach \n in {1,...,6} {

    40 	\path (B) to[out=0,in=-180] node[coordinate,pos=\n/6] (BC\n) {} (C);

    41 	\draw[green!50!brown] (BC\n) -- +(0,1);

    42 	\draw[green!50!brown] (BC\n) -- +(-1.5,-1);

    43 }

    44 \foreach \n in {0,...,6} {

    45 	\path (C) to[out=0,in=-180] node[coordinate,pos=\n/6] (CD\n) {} (D);

    46 	\path (L1) to[out=-30,in=-180] node[coordinate,pos=\n/6] (L1L2\n) {} (L2);

    47 	\draw[blue] (CD\n) -- (L1L2\n);

    48 }

    49 \foreach \n in {0,...,6} {

    50 	\path (L1) to[out=40,in=-140] node[coordinate,pos=\n/6] (L1C\n) {} (C);

    51 	\path (L2) to[out=50,in=-130] node[coordinate,pos=\n/6] (L2D\n) {} (D);

    52 	\draw[blue] (L1C\n) -- (L2D\n);

    53 }

    54 \end{scope}

    55 \end{tikzpicture}