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The children studied in a class room ------ windows were never opened.
The children studied in a class room ------ windows were never opened.
The children studied in a class room ------ windows were never opened.
The children studied in a class room ------ windows were never opened.
The children studied in a class room ------ windows were never opened.
The children studied in a class room ------ windows were never opened.
The children studied in a class room ------ windows were never opened.
The children studied in a class room ------ windows were never opened.
The children studied in a class room ------ windows were never opened.
The children studied in a class room ------ windows were never opened.
The children studied in a class room ------ windows were never opened.
The children studied in a class room ------ windows were never opened.
The children studied in a class room ------ windows were never opened.
The children studied in a class room ------ windows were never opened.
The children studied in a class room ------ windows were never opened.
The children studied in a class room ------ windows were never opened.
The children studied in a class room ------ windows were never opened.
The children studied in a class room ------ windows were never opened.
The children studied in a class room ------ windows were never opened.
The children studied in a class room ------ windows were never opened.
The children studied in a class room ------ windows were never opened.
The children studied in a class room ------ windows were never opened.
The children studied in a class room ------ windows were never opened.
The children studied in a class room ------ windows were never opened.
The children studied in a class room ------ windows were never opened.
The children studied in a class room ------ windows were never opened.
The children studied in a class room ------ windows were never opened.
The children studied in a class room ------ windows were never opened.
The children studied in a class room ------ windows were never opened.
The children studied in a class room ------ windows were never opened.
The children studied in a class room ------ windows were never opened.
The children studied in a class room ------ windows were never opened.
The children studied in a class room ------ windows were never opened.
The children studied in a class room ------ windows were never opened.
The children studied in a class room ------ windows were never opened.
The children studied in a class room ------ windows were never opened.
The children studied in a class room ------ windows were never opened.
The children studied in a class room ------ windows were never opened.
The children studied in a class room ------ windows were never opened.
The children studied in a class room ------ windows were never opened.
The children studied in a class room ------ windows were never opened.
The children studied in a class room ------ windows were never opened.
The children studied in a class room ------ windows were never opened.
The children studied in a class room ------ windows were never opened.
The children studied in a class room ------ windows were never opened.
The children studied in a class room ------ windows were never opened.
The children studied in a class room ------ windows were never opened.
The children studied in a class room ------ windows were never opened.
The children studied in a class room ------ windows were never opened.
The children studied in a class room ------ windows were never opened.