lne/e+ln3/e
    ln0.11
    ln0.90
    ln0.05
    ln0.95
    ln0.31
    ln.31
    ln.73
    ln0.28
    ln0.75
    ln0.8
    ln0.2
    -ln23
    -ln1.2
    -lne
    -ln0.27
    ln（-ln（1-0.73））
    1+1 2+2
    1+1
    ln5

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