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Document `get_slice`.

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14 README.md
@@ -68,3 +68,17 @@ want.
Finally, we increment a counter on the *Gotham City* row. We spotted
some Batmans. The last parameter is the consistency level desired.
+
+### Get Slice ###
+
+A slice is a range of columns ordered by some ordering function
+(Usually lexicographic on the string). To get all superheroes in
+gotham city, we
+could do:
+
+ SliceRange = slice(<<"a">>, <<"z">>),
+ get_slice(Config, <<"gotham_city">>, CP, SliceRange, 1)
+
+to obtain Batman, Catwoman (Rrrrrawr!), Superman, Poison Ivy, and so
+on. Ok, some of those may not be superheroes exactly, but surely you
+get the idea.
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