is mentioned by
| Def member-left-paren(x,y.E(x;y);i;s) == ( | [member-left-paren] |
| Def member-right-paren(x,y.E(x;y);i;s) == ( | [member-right-paren] |
| Def member-paren(x,y.E(x;y);i;s) == ( | [member-paren] |
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