309
c File:  johnson8-2-4.clq
c
c Source: Panos Pardalos pardalos@math.ufl.edu
c
c Reference: Johnson graph: johnsona-b-c is generated by
c            binary vectors of length a and weight b, with
c            two vertices adjacent if the hamming distance
c            between them is at least d.
c
p edge 28 210
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