>>> classmates.insert(-4,'Adam11')
>>> classmates
['Adam11', 'XiaoMing', 'Bob', 'LiLei', 'Adam']
>>> classmates[-4]
'XiaoMing'
>>> classmates[-5]
'Adam11'
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>>> classmates.insert(-4,'Adam11')
>>> classmates
['Adam11', 'XiaoMing', 'Bob', 'LiLei', 'Adam']
>>> classmates[-4]
'XiaoMing'
>>> classmates[-5]
'Adam11'