\begin{tikzpicture}[baseline]
    \draw(0,0) -- (.5,.5);
    \draw (0,0) -- (-.5,.5);
    \draw (0,0) -- (.5,-.5);
    \draw (0,0) -- (-.5,-.5);
    \node at (0,0) [rectangle,draw, fill=white] {$f^{(2)}$};
\end{tikzpicture}
\text{ \quad and \quad }
\begin{tikzpicture}[baseline]
    \draw (3.5,.5) .. controls (4,0) .. (4.5,.5);
    \draw (3.5,-.5) .. controls (4,0) .. (4.5,-.5);
\end{tikzpicture}
