question: public PennTreebankReader ( String treebankHome , String [ ] sections , String parseViewName ) throws Exception { super ( CorpusReaderConfigurator . buildResourceManager ( PENN_TREEBANK_WSJ , treebankHome ) ) ; this . parseViewName = parseViewName ; combinedWSJHome = treebankHome ; if ( sections == null ) this . sections = IOUtils . lsDirectories ( combinedWSJHome ) ; else { this . sections = new String [ sections . length ] ; System . arraycopy ( sections , 0 , this . sections , 0 , sections . length ) ; } updateCurrentFiles ( ) ; }
target:  Reads the specified sections from penn treebank