@subcmd{LAYERED} or @subcmd{SEPARATE} may also be specified. If provided, either
keyword are ignored.
-Groups are formed only by @emph{adjacent} cases. To create a split
+Groups are formed only by @emph{adjacent} cases. To create a split
using a variable where like values are not adjacent in the working file,
you should first sort the data by that variable (@pxref{SORT CASES}).