\unitlength=2.3bp%

\begin{center}
\begin{small}
\begin{feynartspicture}(160,200)(4,5)
%\FALabel(33.,69.96)[]{\large $u\quad u\quad \to\quad W\quad W$}

\FADiagram{}
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\FALabel(1.26965,12.0117)[tr]{$u$}
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\FALabel(2.73035,7.01172)[tl]{$u$}
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\FALabel(17.4558,15.2213)[b]{$W$}
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\FALabel(17.4558,4.77869)[t]{$W$}
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\FALabel(7.,11.07)[b]{$V$}
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\FALabel(16.82,10.)[l]{$F$}
\FAProp(16.,13.5)(10.,10.)(0.,){/Straight}{0}
\FALabel(12.825,12.3929)[br]{$F$}
\FAProp(16.,6.5)(10.,10.)(0.,){/Straight}{0}
\FALabel(12.825,7.60709)[tr]{$F$}
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\FAVert(10.,10.){0}

\FADiagram{}
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\FALabel(2.73035,7.01172)[tl]{$u$}
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\FALabel(12.825,12.3929)[br]{$S$}
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\FALabel(12.825,7.60709)[tr]{$S$}
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\FADiagram{}
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\FALabel(12.825,12.3929)[br]{$U$}
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\FALabel(12.825,7.60709)[tr]{$U$}
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\FADiagram{}
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\FALabel(1.26965,12.0117)[tr]{$u$}
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\FALabel(2.73035,7.01172)[tl]{$u$}
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\FALabel(12.699,12.6089)[br]{$V$}
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\FADiagram{}
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\FALabel(2.73035,7.01172)[tl]{$u$}
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\FADiagram{}
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\FADiagram{}
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\FADiagram{}
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\FADiagram{}
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\FADiagram{}
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\FADiagram{}
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\FADiagram{}
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\FADiagram{}
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\FADiagram{}
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\FADiagram{}
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\FADiagram{}
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\FADiagram{}
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\FADiagram{}
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\FADiagram{}
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\FALabel(1.88398,11.884)[tr]{$u$}
\FAProp(0.,5.)(5.,10.)(0.,){/Straight}{-1}
\FALabel(3.11602,6.88398)[tl]{$u$}
\FAProp(20.,15.)(14.5,13.5)(0.,){/Sine}{-1}
\FALabel(16.8422,15.2654)[b]{$W$}
\FAProp(20.,5.)(12.5,8.)(0.,){/Sine}{1}
\FALabel(15.6743,5.54086)[t]{$W$}
\FAProp(5.,10.)(12.5,8.)(0.,){/Sine}{0}
\FALabel(8.35062,7.98234)[t]{$V$}
\FAProp(14.5,13.5)(12.5,8.)(0.8,){/Sine}{0}
\FALabel(10.3233,12.0797)[r]{$V$}
\FAProp(14.5,13.5)(12.5,8.)(-0.8,){/Sine}{0}
\FALabel(16.6767,9.4203)[l]{$V$}
\FAVert(5.,10.){0}
\FAVert(14.5,13.5){0}
\FAVert(12.5,8.){0}

\FADiagram{}
\FAProp(0.,15.)(5.,10.)(0.,){/Straight}{1}
\FALabel(1.88398,11.884)[tr]{$u$}
\FAProp(0.,5.)(5.,10.)(0.,){/Straight}{-1}
\FALabel(3.11602,6.88398)[tl]{$u$}
\FAProp(20.,15.)(12.5,12.)(0.,){/Sine}{-1}
\FALabel(15.6743,14.4591)[b]{$W$}
\FAProp(20.,5.)(14.5,6.5)(0.,){/Sine}{1}
\FALabel(16.8422,4.73462)[t]{$W$}
\FAProp(5.,10.)(12.5,12.)(0.,){/Sine}{0}
\FALabel(8.35062,12.0177)[b]{$V$}
\FAProp(14.5,6.5)(12.5,12.)(0.8,){/ScalarDash}{0}
\FALabel(16.4417,10.4943)[l]{$S$}
\FAProp(14.5,6.5)(12.5,12.)(-0.8,){/ScalarDash}{0}
\FALabel(10.5583,8.00573)[r]{$S$}
\FAVert(5.,10.){0}
\FAVert(14.5,6.5){0}
\FAVert(12.5,12.){0}
\end{feynartspicture}

\begin{feynartspicture}(120,40)(3,1)
\FADiagram{}
\FAProp(0.,15.)(5.,10.)(0.,){/Straight}{1}
\FALabel(1.88398,11.884)[tr]{$u$}
\FAProp(0.,5.)(5.,10.)(0.,){/Straight}{-1}
\FALabel(3.11602,6.88398)[tl]{$u$}
\FAProp(20.,15.)(12.5,12.)(0.,){/Sine}{-1}
\FALabel(15.6743,14.4591)[b]{$W$}
\FAProp(20.,5.)(14.5,6.5)(0.,){/Sine}{1}
\FALabel(16.8422,4.73462)[t]{$W$}
\FAProp(5.,10.)(12.5,12.)(0.,){/Sine}{0}
\FALabel(8.35062,12.0177)[b]{$V$}
\FAProp(14.5,6.5)(12.5,12.)(0.8,){/Sine}{0}
\FALabel(16.6767,10.5797)[l]{$V$}
\FAProp(14.5,6.5)(12.5,12.)(-0.8,){/Sine}{0}
\FALabel(10.3233,7.9203)[r]{$V$}
\FAVert(5.,10.){0}
\FAVert(14.5,6.5){0}
\FAVert(12.5,12.){0}

\FADiagram{}
\FAProp(0.,15.)(4.,10.)(0.,){/Straight}{1}
\FALabel(1.26965,12.0117)[tr]{$u$}
\FAProp(0.,5.)(4.,10.)(0.,){/Straight}{-1}
\FALabel(2.73035,7.01172)[tl]{$u$}
\FAProp(20.,15.)(15.5,10.)(0.,){/Sine}{-1}
\FALabel(18.4221,11.9431)[tl]{$W$}
\FAProp(20.,5.)(15.5,10.)(0.,){/Sine}{1}
\FALabel(18.4221,8.0569)[bl]{$W$}
\FAProp(4.,10.)(10.,10.)(0.,){/Sine}{0}
\FALabel(7.,11.07)[b]{$V$}
\FAProp(10.,10.)(15.5,10.)(0.8,){/ScalarDash}{0}
\FALabel(12.75,6.98)[t]{$S$}
\FAProp(10.,10.)(15.5,10.)(-0.8,){/ScalarDash}{0}
\FALabel(12.75,13.02)[b]{$S$}
\FAVert(4.,10.){0}
\FAVert(10.,10.){0}
\FAVert(15.5,10.){0}

\FADiagram{}
\FAProp(0.,15.)(4.,10.)(0.,){/Straight}{1}
\FALabel(1.26965,12.0117)[tr]{$u$}
\FAProp(0.,5.)(4.,10.)(0.,){/Straight}{-1}
\FALabel(2.73035,7.01172)[tl]{$u$}
\FAProp(20.,15.)(15.5,10.)(0.,){/Sine}{-1}
\FALabel(18.4221,11.9431)[tl]{$W$}
\FAProp(20.,5.)(15.5,10.)(0.,){/Sine}{1}
\FALabel(18.4221,8.0569)[bl]{$W$}
\FAProp(4.,10.)(10.,10.)(0.,){/Sine}{0}
\FALabel(7.,11.07)[b]{$V$}
\FAProp(10.,10.)(15.5,10.)(0.8,){/Sine}{0}
\FALabel(12.75,6.73)[t]{$V$}
\FAProp(10.,10.)(15.5,10.)(-0.8,){/Sine}{0}
\FALabel(12.75,13.27)[b]{$V$}
\FAVert(4.,10.){0}
\FAVert(10.,10.){0}
\FAVert(15.5,10.){0}

\end{feynartspicture}
\end{small}
\end{center}
