fact: Definition union (o1 o2: option bool) : option bool := match o1 , o2 with | Some b1 , Some b2 => if Bool.eqb b1 b2 then o1 else None | _ , _ => None end.
imports: Cdcl.PatriciaR Cdcl.KeyInt Cdcl.ReifClasses Cdcl.Lib Bool Setoid ZifyBool ZArith Uint63 Lia List Cdcl.Syntax Cdcl.Clause