17
one<>three<>1 0.5556 5 13 5
one<>two<>2 0.5000 5 13 7
two<>two<>3 0.4000 2 3 7
one<>four<>4 0.3333 3 13 5
three<>four<>4 0.3333 1 1 5
two<>four<>5 0.2500 1 3 5