There are three questions I ask in my Formal Lang Theory class that even the very best students get wrong. Two I knew were trick quesions, the other I was surprised by 1) If w is a string then SUBSEQ(w) is all strings you can form by replacing some symbols in w with empty string. SUBSEQ(L) is defined in the obv way. I ask the following in class (not on an exam). TRUE or FALSE and WHY and we'll dis