    Sentence .1: In. interviews with engineers.7  most,of whom. have .not, spoken publicly  until, .now,,,..the, lines of discord,.between  NASA...'s.. engineers and... managers, are  evident .    Sentence..2;,Jn, interviews, with-numerous  engineers,,, mast of.whom have not.spoken  publicly -until_now., the,lines.of discord  between.NASA ‘s.engineers and\managers  stand out in stark relief...