how winston commints thought crime in book one

He writes in a diary in a cubby hole in the corner of his flat.

Just to clarify, Winston is committing thought-crime in his head all the time in book one. He visits the Prole areas and even visits a prostitute though we don't know exactly when. He also buys a glass covered shell. Actual physical manifestations of his thought crime in book one can be traced to his diary.

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http://profitsee.org/ref.php?page=act/ref&invcod=11442