Question: When inserting into an alphabetically sorted list: if the list is singly linked, we will need an extra trail pointer if the list is doubly

When inserting into an alphabetically sorted list:

if the list is singly linked, we will need an extra "trail" pointer
if the list is doubly linked, we will need an extra "trail" pointer
we will never need the "trail" pointer
you cannot insert in singly linked list because it is not possible to traverse the list backwards

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