Actually, in this case, you can just skip your steps 78 and 79:
80:77:ss2abdv |- ( ( A e. RR* /\ B e. RR* /\ C e. RR* )
-> { x | ( x e. ( A (,] B ) /\ x e. ( B [,) C ) ) }
C_ { x | x e. ( B [,] B ) } )
Note that bnj1153 is discouraged!
I guess you have to revert to using elin directly.
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