Seven small towns__h,i,j,k,l,m,n,are serviced by 3 roads _route1,route2,route3
route1 ends at n &l,and passes through m only
route2 starts at h ,then passes through l &i ,and ends back at h
route3 ends at n&k,and passes through j only
two towns are directly connected if a person can drive from one of the town to the other without passing throughout the town.
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