1 | 3. u: Term 4. v: Term List 5. te:(Label Label  ), rho,ds,da,de,e,s,a,x:Top.
list_accum(x,t.x
([[t]] 1of(e) s a mk_trace_env(nil,
te));x;v) ~ list_accum(x,t.x([[t]] 1of(e) s a niltrace());x;v) te:(Label Label  ), rho,ds,da,de,e,s,a,x:Top.
list_accum(x,t.x
([[t]] 1of(e) s a mk_trace_env(nil,
te));x
([[u]] 1of(e) s a mk_trace_env(nil,
te));v) ~ list_accum(x,t....;x
(...);v) |