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We consider the four neutrino oscillation that accommodate the all neutrino oscillation data. We consider the range of the corresponding mixing parameters by the result of neutrino oscillation experiments. Implicaion of the neutrino oscillation search for the neutrino mass square difference and mixing are discussed. We determine the possible values of the effective majorana neutrino mass    $| |=|{\sum }_{j}U_{ej}^{2}m_{j}|$  | &lt; m &gt; | = | ∑ j U e j 2 m j | in the four neutrino scenario. In the four-neutrino scheme there is an upper bound on |   | of the normal mass order is 2.0074eV for  α  = 0 ∘ , β  = 0 ∘  a  n  d  γ  = 0 ∘ . In the case of inverted mass order the upper bound on |   | is 2.0069eV for  α  = 0 ∘ , β  = 0 ∘  a  n  d  γ  = 0 ∘ .

Effective Neutrino Masses from Four Flavor Neutrino Mixing Matrix