Plan 9 from Bell Labs’s /usr/web/sources/patch/applied/rc-subseq/readme

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cleaned up version of erik quanstrom's suggestion.
allows

	$x(1-5)
	$x(3-)

as subscript notation.  this is fantastic, because it means
i can start writing

	x=$x(2-)

and retire my old idiom

	*=($x); shift; x=($*)

☺


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