#print
Remembering that 'i' inserts one line before
the 'a' command, so that after 
  3a
the first input line is number 4 while after
  3i
the first input line is number 3, what command
using 'i' is the same as the command
  5a
to the editor?  Type "answer XX" where XX is that
command.
#copyin
#user
#uncopyin
#match 6i
#log
#next
18.2c 5