4.3BSD-UWisc/lib/learn/editor/L20.01c

#print
There is a file in this directory called 'twister'.
Edit it, delete lines 1 through 500, and then undo the deletion.
End with write, quit, and ready, as usual.
#create twister
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#copyin
#user
#uncopyin
wc twister | grep 512 > /dev/null
#log
#next
20.1a 10
20.2a 5