`Ce^(+3) lt La^(+3) lt PM^(+3) lt Yb^(+3)``Yb^(+3) lt Pm^(+3) lt La^(+3) lt Ce^(+3)``Yb^(+3) lt Pm^(+3) lt Ce^(+3) lt La^(+3)``Pm^(+3) lt La^(+3) lt Ce^(+3) lt Yb^(+3)`
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