x:Label. rel_mentions(r;x) 
covers_var(A;x)
fr:frame(). fr 
< fr A.frame | 
fr.var =
x > & (a:Label. (a fr.acts) (ef:eff(). ef < ef A.eff | ef.kind = a & ef.smt.lbl = x > ))
is mentioned by
| Def covers_rel(A;r) == x:Label. rel_mentions(r;x) covers_var(A;x) | [covers_rel] |
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