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\begin{tikzpicture}[>={Stealth[scale=2]}, % arrow head
shorten > = 3pt,
node distance = 1cm and 2cm,
el/.style = {inner sep=5pt, font=\normalsize, align=center, sloped},
state/.style = {minimum size=2.5cm, circle, draw=black, fill=white}, %node styles
plain/.style = {rectangle},
wave/.style = {draw, rectangle, inner sep=10},
path/.style = {color=green}
% every label/.append style = {font=\tiny}, unused node labels
\node (waves) [wave, align=center] {Pandemic\\``Waves''};
\node (pasts) [plain, left=of waves, yshift=1cm] {Colonial Pasts};
\node (futures) [plain, left=of waves, yshift=-1cm] {Statistical Futures};
\node (natural) [plain, right=of waves, yshift=1.5cm] {Virus as a natural event};
\node (govt) [plain, right=of waves, yshift=0.5cm] {Who can swim?};
\node (individual) [plain, right=of waves, yshift=-0.5cm] {Responsibility on individuals};
\node (death) [plain, right=of waves, yshift=-1.5cm] {Deaths/Economy calculus};
\node (pull) [plain, above=of waves, xshift=-1cm] {PULL};
\node (pull) [plain, above=of waves, xshift=1cm] {PUSH};
\draw [dashed] (0,1) -- (0,3);
\draw [dashed] (0,-1) -- (0,-3);
% Connections
\path[->, out=-70, in=-170, color=green] (pasts) edge (waves);
\path[->, out=70, in=-190, color=green] (futures) edge (waves);
\path[->, out=15, in=-180, color=green] (waves) edge (natural);
\path[->, out=5, in=-180, color=green] (waves) edge (govt);
\path[->, out=-5, in=-180, color=green] (waves) edge (individual);
\path[->, out=-15, in=-180, color=green] (waves) edge (death);
% \path[<->, >={Stealth[scale=1]}, out=0, in=0, looseness=3]
% (natural.east) edge (govt.east)
% (govt.east) edge (individual.east)
% (individual.east) edge (death.east);
% Loop back
\path[->, shorten < = 10pt, color=green] (natural) edge [bend right=45] (pasts);
\path[->, shorten < = 10pt, color=green] (death) edge [bend left=45] (futures.south);
% \path[->]
% (pasts.east) edge [bend right=5] (waves.west)
% (futures.east) edge [bend left=5] (waves.west);