Restore Py2.x version of sample call to super().
diff --git a/Doc/library/collections.rst b/Doc/library/collections.rst
index ab9d505..2f7785e 100644
--- a/Doc/library/collections.rst
+++ b/Doc/library/collections.rst
@@ -252,11 +252,12 @@
c += Counter() # remove zero and negative counts
Several multiset mathematical operations are provided for combining
-:class:`Counter` objects. Multisets are like regular sets but are allowed to
-contain repeated elements (with counts of one or more). Addition and
-subtraction combine counters by adding or subtracting the counts of
-corresponding elements. Intersection and union return the minimum and maximum
-of corresponding counts. Each operation can accept inputs with signed counts,
+:class:`Counter` objects. Multisets are counters with the restriction
+that all counts are at least one. They are like regular sets but are
+allowed to contain repeated elements. Addition and subtraction combine
+counters by adding or subtracting the counts of corresponding elements.
+Intersection and union return the minimum and maximum of corresponding
+counts. Each operation can accept inputs with signed counts,
but the output excludes results with counts less than one.
>>> c = Counter(a=3, b=1)