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Arrange La$^{3+}$, Pm$^{3+}$, Yb$^{3+}$ and Ce$^{3+}$ in order of increasing ionic radii

$\begin{array}{1 1}La^{3+} < Pm^{3+} < Yb^{3+} < Ce^{3+} \\Pm^{3+} < La^{3+} < Yb^{3+} < Ce^{3+} \\ Yb^{3+} < Pm^{3+} < Ce^{3+} < La^{3+} \\ Yb^{3+} < Ce^{3+} < Pm^{3+} < La^{3+}\end{array}$

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