# this file invokes proj6data4.txt
# which invokes this file causing a potential 
# infinite recursive loop
i 2 5
i 3 6
i 4 3
i 4 6
i 6 7
i 5 4
i 5 7
i 7 6
l
t 1 2
t 1 5
t 5 1
t 2 6
f proj6data4.txt
t 7 2
t 5 5
i 6 1
t 7 2
t 5 5
d 6 1
t 7 2
t 5 5  
t 1 6