#print
The current directory contains a file
named 'hand'.  The third line is missing:
add the line

middle finger

after line 2 of this file.
Check what you're doing by printing the file
with 
  1,$p
before and after the change.
Then rewrite the file with the usual w, q,
and then type "ready".
#create Ref
thumb
index finger
middle finger
ring finger
little finger
#create hand
thumb
index finger
ring finger
little finger
#create rhand
thumb
index finger
ring finger
little finger
#pipe
#user
#unpipe
#cmp hand Ref
#log
#next
17.2a 5
18.1a 10
18.2a 7