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We examine the constraints on the MNS lepton mixing matrix =66rom the presentand future experimental data of the neutrino oscillation, tritium beta decay,and neutrinoless double beta decay for Majorana neutrinos. We show that thesmall mixing angle solutions for solar neutrino problem are disfavored forsmall averaged mass ($<m_\nu>$) of neutrinoless double beta decay ($\leq 0.01$eV) in the inverse neutrino mass hierarchy scenario. This is the case even inthe normal mass hierarchy scenario except for very restrictive value of theaveraged neutrino mass ($\bar{m_\nu}$) of single beta decay. The lower massbound for $\bar{m_\nu}$ is given from the present neutrino oscillation data. Weobtain some relations between $<m_\nu>$ and $\bar{m_\nu}$. The constraints onthe Majorana CP violating phases are also given.Comment: 25pages, 10figure

Maki-Nakagawa-Sakata parameters from neutrino oscillations, single beta decay, and double beta decay