list is empty

attempt to add a after x
empty list, OK
list is a

attempt to add d after a
list is ad

attempt to add b after a
list is abd

attempt to add c after b
list is abcd

attempt to add x after y
y not found, nothing added
list is abcd

attempt to delete x
x not found, nothing deleted
list is abcd

attempt to delete b
deleting b
list is acd

attempt to delete a
deleting first item
list is cd

attempt to delete d
deleting d
list is c

attempt to delete c
deleting first item
list is empty

attempt to delete x
empty list, can't delete
list is empty