I forgot to add that I passing a tuple of functions to the reduce function but apparently that is not allowed. My guess was that a tuple made up of individual (simple) functions might be easier to manipulate programatically than a function which has to know the structure of a list.
(My test code)
x=[('a',1),('a',1),('a',3),('b',1),('b',2),('c',2),('c',3),('c',4)]
reduce((lambda x,y: x+y,lambda x,y: x+y),x)
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