List of lists
x = ['abc', 'def']
print(x) # ['abc', 'def']
y = [x, 'xyz']
print(y) # [['abc', 'def'], 'xyz']
print(y[0]) # ['abc', 'def']
print(x[0]) # abc
print(y[0][0]) # abc
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x = ['abc', 'def']
print(x) # ['abc', 'def']
y = [x, 'xyz']
print(y) # [['abc', 'def'], 'xyz']
print(y[0]) # ['abc', 'def']
print(x[0]) # abc
print(y[0][0]) # abc