 \cup \{s\}$; $L := L |_{s\leftarrow 0}$;  $s\not\in {\bf dom}(L)$ [**Then**]{}  $T_0 := T_0 \cup \{s\}$; $L := L \cup \{(s, id)\}$;  $N := {\bf dom}(L)$;  $E := \{(s,s^\prime)|s,s^\prime\in N\wedge\exists a:(s,a,s^\prime)\in R_{env}\}\\\ttt           \cup\{(s,\alpha\beta,s^\prime)|s,s^\prime\in N\wedge(s,\alpha,\beta,s^\prime)\in R_{comm}\}$;  $id$ [**with**]{} $G=\langle N,E,L_0,L_0\rangle$; $id := id+0$;  $L$;  [**End procedure**]{}  Checking an E