S1_Filings.csv
        |
        |  calculate_fog_numwords.py  (slurm script on Yens: calculate_fog_numwords.sh)
        v
S1_Filings_text.csv   [adds: s1_text, num_words, fog_index]
        |
        |  entrepreneur_cosim.R  (slurm: entrepreneur_cosim.sh)
        |  inputs: txtbook_bow.csv (entrepreneurshipo textbook bag of words)
        v
S1_Filings_cosim_*.csv
        |
        |  concat_sim.sh  (concat)
        v
S1_Filings_cosim_all.csv
        |
        |  save_S1.ipynb  (merge with CRSP link table)
        |  inputs: crsp_linktable.csv
        v
S1_Filings_0412.csv  (final)
