[Tutor] how to make a reference to part of list?

[Xie Chao]

Namely, if  list1 = {1, 2, 3}, and I wanna make a reference, say "ref",  to list1's sublist (which is also of type list), say {2, 3}, so that when I make change to ref[0], then list1[1] will be changed!
      But how can I make such a reference, 3x!

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