I am trying to group this list together
M1 = [['a', 14], ['a',7], ['a',16],['b',3],['b',15],['c',22],['c',1],['c',5]]
Meaning group all the 'a' value together same goes for 'b', 'c' and so on
Read more here: https://stackoverflow.com/questions/67394188/add-to-a-list-based-on-previous-value
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