Fig. 3From: Enumeration method for tree-like chemical compounds with benzene rings and naphthalene rings by breadth-first search orderIllustration of three molecular trees such that T(u)> s T(v) or T(u)> m T(v). a l(u)>l(v). b l(u)=l(v), T(u 1)> s T(v 1). c l(u)=l(v), T(u 1)= s T(v 1), h=2>1=k. d T(u)= s T(v), m u l(e 1)>m u l(e1′)Back to article page