Basic Examples 
(2)
 

Sort
the keys of an association and collect values that end up having the same key:
In[1]:=
[◼]
KeyCombine
[Sort,<|{1,2}10,{2,1}5,{1,3}30|>]
Out[1]=
{1,2}{10,5},{1,3}{30}
———
Sum values instead of collecting them:
In[1]:=
[◼]
KeyCombine
[Sort,<|{1,2}10,{2,1}5,{1,3}30|>,Total]
Out[1]=
{1,2}15,{1,3}30

Applications 
(2)
 


Properties and Relations 
(1)
 
