Make an educated guess as to the most common syntax error in Lisp

. Lisp began as a pure functional language but gradually acquired more
and more imperative features. Why?

. Describe in detail the three most important reasons, in your opinion,
why ALGOL 60 did not become a very widely used language.

. Why, in your opinion, did COBOL allow long identifiers when Fortran
and ALGOL did not?

Outline the major motivation of IBM in developing PL/I.

Was IBMs assumption, on which it based its decision to develop PL/I,

correct, given the history of computers and language developments since