def sort(a):
for k in range(len(a)):
(a[k][0],a[k][1]) = (a[k][1],a[k][0])
a.sort()
for k in range(len(a)):
(a[k][0],a[k][1]) = (a[k][1],a[k][0])
a = [[1,2,4],[6,5,6],[2,5,9]]
sort(a)
print(a)
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