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PH        x/mL        y/mL        PH        x/mL        y/mL
8.6        50        4.0        9.6        50        22.4
8.8        50        6.4        9.8        50        27.2
9.0        50        8.8        10.0        50        32.0
9.2        50        12.0        10.4        50        38.6
9.4        50        16.8        10.6        50        45.5
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