\begin{tabbing}
$\forall$${\it the\_w}$:World, $e$:E, $t$:$\mathbb{N}$.
\\[0ex]FairFifo
\\[0ex]$\Rightarrow$ isrcv(kind($e$))
\\[0ex]$\Rightarrow$ match(lnk(kind($e$));$t$;time($e$))
\\[0ex]$\Rightarrow$ \=onlnk(lnk(kind($e$));m(source(lnk(kind($e$)));$t$))\+
\\[0ex][$\parallel$rcvs(lnk(kind($e$));time($e$))$\parallel-\parallel$snds(lnk(kind($e$));$t$)$\parallel$]
\\[0ex]$=$
\\[0ex]msg(a(loc($e$);time($e$)))
\\[0ex]$\in$ Msg
\-
\end{tabbing}