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Book VI   Proposition 10
    Let AB be the given uncut straight line
and
    AC the straight line cut at the points D, E;
and
    let them be so placed as to contain any angle;

    let CB be joined,
and through D, E
    let DF, EG be drawn parallel to BC,
and through D
    let DHK be drawn parallel to AB. [I.31]

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