1 | 15. x:Label. rel_mentions(r;x)  covers_var(A;x) 16. p:pre().
p A.pre

p.kind = kind(a)  [[p.rel]] rho A.ds dec_lookup(A.da;kind(a)) de e s value(a) niltrace() 17. ef:eff().
ef A.eff

ef.kind = kind(a)

x'.ef.smt.lbl = [[ef.smt.term]] 1of(e) s value(a) niltrace() [[ef.smt.typ]] rho 18. fr:frame(). fr A.frame  (kind(a) fr.acts)  x'.fr.var = s.fr.var [[fr.typ]] rho 19. x:Label. rel_mentions(r;x)  covers_var(A;x) 20. value(a) [[dec_lookup(A.da;kind(a))]] rho 21. r@0:rel().
r@0 col_subst2( x.smts_eff(action_effect(kind(a);A.eff;A.frame);x);r)

[[r@0]] rho A.ds dec_lookup(A.da;kind(a)) de e s value(a) tr 22. x: Label 23. pred_mentions( < r > ;x) rel_mentions(r;x) |