Removing duplicates from list of lists in Python

Question

Can anyone suggest a good solution to remove duplicates from nested lists if wanting to evaluate duplicates based on first element of each nested list?

The main list

Answer 1

If the order does not matter, code below

print [ [k] + v for (k, v) in dict( [ [a[0], a[1:]] for a in reversed(L) ] ).items() ]

gives

[['2', '5', '6'], ['14', '65', '76'], ['7', '12', '33']]