A series of pairs of graphs
(Γk,Γ′k), k = 0,1,2,… , has been considered as candidates for dual pairs
of principal graphs of subfactors of small Jones index above 4 and it has
recently been proved that the pair (Γk,Γ′k) comes from a subfactor if and
only if k = 0 or k = 1. We show that nevertheless there exists a unique
fusion system compatible with this pair of graphs for all nonnegative integers
k.