Begin reading the file stopping as soon as possible. Next graph events stored in the file will be sent by calling {@link #nextEvents()} or{@link #nextStep()}. Once begin() has been called, you must finish the reading process using {@link #end()}. You cannot call begin() twice without having called {@link #end()} in between.
@param fileName Name of the file to read.
@throws IOException If an I/O error occurs while reading.
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