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yao@ubuntu:~/perl$ perl abstract_extractor_by_ting 2.txt
sort: open failed: words_in_SENTENCES: No such file or directory
uniq: SENTENCES_words_sort: No such file or directory
...
uniq: words_in_SENTENCES_words_comb: No such file or directory
sh: 1: spell: not found
sort: open failed: SENTENCES_WORDS_root: No such file or directory

#!/site/bin/perl

system("perl5 sentence_words SENTENCES ADDED_WORDS_LIST");
...
system("perl5 keyword_subject SENTENCES_STEM SENTENCES_words");

unlink(SENTENCES_words);