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\draw (-2,0) node[left] {$\varphi_a$} -- (0,0) -- (1.5,1.5) node[above right] {$\varphi_b$} (0,0) -- (1.5,-1.5) node[below right] {$\varphi_c$}; \draw[->,yshift=5pt ...
-- [charged boson, quarter left, edge label=$q$] d [crossed dot] -- [charged boson, quarter left, edge label=$q$] a, ...
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