typos. Added text about sequence error
typos. Added text about sequence error

Read-Lab-Confederation/nyc-subway-anthrax-study,Read-Lab-Confederation/nyc-subway-anthrax-study,Read-Lab-Confederation/nyc-subway-anthrax-study,Read-Lab-Confederation/nyc-subway-anthrax-study,Read-Lab-Confederation/nyc-subway-anthrax-study,Read-Lab-Confederation/nyc-subway-anthrax-study