| LBind K I ⇒ (append L K).ⓘ[I]
].
-interpretation "append (local environment)" 'nplus L1 L2 = (append L1 L2).
+interpretation "append (local environment)" 'plus L1 L2 = (append L1 L2).
interpretation "local environment tail binding construction (generic)"
'SnItem I L = (append (LBind LAtom I) L).