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...l surface]] whose ''intrinsic'' structure is preserved and constitutes the geometric prototype of WIHs and IHs, while a WIH is a NEH with a well-defined [[surfa ...me="ref1" /><ref name="ref2" /><ref name="ref3" /> "hat" over the equality symbol <math>\hat=</math> means equality on the black-hole horizons (NEHs), and "h ...