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As described in Constructions, any given construction foreground
may or may not use one among a handful of extensions. Which
construction use which extension (if any) and what it means is described
throughout Foregrounds. On that ground, the behavior of this
command depends upon the selected construction’s foreground. If the
selected con doesn’t use any extension ‘NO EXTENSION’ is
displayed on the message line and the mouse cursor is set to
UNAVAILABLE
.