7 \begin{tabular
}[C
]{c
} \hlx*
{hv
}
8 \tt{Elemental dominance
} \\
\hlx{vhv
}
15 !
{"a"; "w" !U*d@
{>
} \ellipse r,_,d
{-
}}
16 !
{"w"; "f" !R*l@
{>
} \ellipse d,_,l
{-
}}
17 !
{"f"; "e" !D*u@
{>
} \ellipse l,_,u
{-
}}
18 !
{"e"; "a" !L*r@
{>
} \ellipse u,_,r
{-
}}