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We have shown in a previous paper that two identical detectors with eachfiducial mass of 0.27 megaton water, one in Kamioka and the other in Korea,which receive the (anti-) muon neutrino beam of 4 MW power from J-PARC facilityhave potential of determining the neutrino mass hierarchy and discovering CPviolation by resolving the degeneracies associated with them. In this paper, wepoint out that the same setting has capability of resolving the \theta_{23}octant degeneracy in region where sin^2 2\theta_{23} \lsim 0.97 at 2 standarddeviation confidence level even for very small values of \theta_{13}.Altogether, it is demonstrated that one can solve all the eight-fold neutrinoparameter degeneracies in situ by using the Tokai-to-Kamioka-Korea setting if\theta_{13} is within reach by the next generation superbeam experiments. Wealso prove the property called ``decoupling between the degeneracies'', whichis valid to first order in perturbation theory of the earth matter effect, thatguarantees approximate independence between analyses to solve any one of thethree different type of degeneracies.Comment: 21 pages, 6 figure

Resolving the eightfold neutrino parameter degeneracy by two identical detectors with different baselines