% PFP

\begin{tikzpicture}[xscale=.5]
\node(T1) at (0,0) {$\updown{1}$};
\node(T2) at (1,0) {$\updown{2}$};
\node(T3) at (2,0) {$\updown{3}$};
\node(T4) at (3,0) {$\updown{4}$};
\node(T5) at (4,0) {$\updown{5}$};
\node(T6) at (5,0) {$\updown{6}$};
\node(T7) at (6,0) {$\updown{7}$};
\draw[->, line width = 0.5, color=blue] (T2) edge [bend left=70] (T3);
\draw[->, line width = 0.5, color=blue] (T2) edge [bend left=70] (T4);
\draw[->, line width = 0.5, color=blue] (T3) edge [bend left=70] (T4);
\draw[->, line width = 0.5, color=blue] (T5) edge [bend left=70] (T6);
\draw[->, line width = 0.5, color=red] (T5) edge [bend left=70] (T4);
\draw[->, line width = 0.5, color=red] (T7) edge [bend left=70] (T6);
\draw[->,line width = 0.5, color=white, opacity=0] (T1) edge [bend left=70] (T7);
\draw[->,line width = 0.5, color=white, opacity=0] (T7) edge [bend left=70] (T4);
\end{tikzpicture}