>>>>> "j" == jun  <netjune@163.com> writes:

j> like this: (copy-sequence seq &optional from to). 'from' and 'to' mean the
j> same as in the function 'substring'.

I'd rather not overload copy-sequence that way, and rather have a new function
named (sublist LIST &optional FROM TO), even if copy-sequence xs == sublist xs.