4.3BSD-UWisc/lib/learn/editor/L30.2e

#print
Now edit the file named "town" and change
the 'q' on the last line to a 'p'.  Rewrite the
corrected file and type 'ready'.
#create Ref
south orange
maplewood
millburn
short hills
summit
new providence
#create town
south orange
maplewood
millburn
short hills
summit
new qrovidence
#user
#cmp town Ref
#log
#next
30.2f 5
31.1a 10