t = (1, 2)
print(t)

l = [1, 2]
print(l)

l[0] = 10
l.append(19)
print(l)

#t[0] = 11
print('t[0]:', t[0])

print('line 12 ----------')
t = ([1, 2], [2, 3])
print(t)
#t[0] = [3, 4]
print('line 18 ----------')
t[0][0] = 3
t[0][1] = 4
print(t)

