visualize: count uniqueness with pertial order
visualize: count uniqueness with pertial order

Signed-off-by: Hitoshi Mitake <eb58f5b673acb397722a8259c58efc507dd85d76@lab.ntt.co.jp>

osrg/namazu,AkihiroSuda/earthquake,osrg/earthquake,fuku-ys/earthquake,osrg/namazu,osrg/earthquake,AkihiroSuda/earthquake,fuku-ys/earthquake,osrg/namazu,fuku-ys/earthquake,fuku-ys/earthquake,osrg/namazu,osrg/earthquake,AkihiroSuda/earthquake,AkihiroSuda/earthquake,fuku-ys/earthquake,osrg/earthquake,osrg/earthquake,AkihiroSuda/earthquake,osrg/namazu,AkihiroSuda/earthquake,fuku-ys/earthquake,osrg/namazu,AkihiroSuda/earthquake,AkihiroSuda/earthquake,osrg/earthquake,fuku-ys/earthquake,fuku-ys/earthquake,osrg/earthquake,osrg/namazu