get a few lines of text started for the set/bag operators

Author: timo

S03-operators.pod

@@ -3288,6 +3288,43 @@ The various operators for sets and bags (intersection, union,
 etc.) also have junctive precedence (except for those that return Bool,
 which are instead classified as chaining operators).
 
+=head1 Set and Bag operators
+
+These operators work on Sets, Bags or Positionals that will be coerced to sets.
+
+=head2 with "junctive and" precedence
+
+  Unicode  Texas    Explanation
+  =======  =====    ===========
+           (&)      Set or Bag with all elements that are in both the lhs and rhs
+           (.)      Bag with the elements of lhs and rhs multiplied.
+
+=head2 with "junctive or" precedence
+
+  Unicode  Texas    Explanation
+  =======  =====    ===========
+           (-)      Set or Bag with all elements of the rhs removed
+           (+)      Set or Bag with all elements of the lhs and rhs summed
+           (^)      Set with elements that are in lhs, or rhs, but not in both
+           (|)      Set with elements that are in the lhs or rhs or both
+
+=head2 with "chaining infix" precedence
+
+This section contains all the set comparison operators:
+
+  Unicode  Texas    Explanation
+  =======  =====    ===========
+           (elem)   lhs is an element of the set on the rhs
+           !(elem)  lhs is not an element of the set on the rhs
+           (cont)   lhs completely contains the set on the rhs
+           !(cont)  lhs doesn't completely contain the set on the rhs
+           (<)      all elements in the lhs and more are also in the rhs
+           (<=)     all elements in the lhs are also in the rhs
+           (>)      all elements in the rhs and more are also in the lhs
+           (>=)     all elements in the rhs are also in the lhs
+           (<+)     all elements in the lhs bag are contained more often in the rhs bag
+           (>+)     all elements in the lhs bag are contained less often in the rhs bag
+
 =head1 Comparison semantics
 
 =over