there are no strong references to the key. In other words, an
ephemeron is broken when nobody else cares about its key. In
particular, the datum holding a reference to the key will not in
-itself prevent the ephemeron from becoming broken (in contrast,
-@xref{Weak Pairs}). Once broken, ephemerons never cease to be broken;
+itself prevent the ephemeron from becoming broken; in contrast,
+@xref{Weak Pairs}. Once broken, ephemerons never cease to be broken;
setting the key or datum of a broken ephemeron with
@code{set-ephemeron-key!} or @code{set-ephemeron-datum!} has no
effect. Note that an ephemeron's reference to its datum may be