

list1 = [[]]
list1.append([])
list1[0].append(4)
list1[0].append(5)
list1[1].append(1)
list1[1].append(2)
list1[2].append(7)
#list1[2].append(8)
#list1.append([11,21])
#list1[3].append(65)
print(list1[1][1])
#print(list1[0][1])
print(list1[0] == [])
print(len(list1[0]))
#list1.pop(2)
print(list1)