The Purple Heart of wartime propaganda that had a stereotypical portrayal of the Japanese (usually by actors of non-Japanese origin) as sadistic tyrants trying to wrest the secret of their aircraft carrier's location during torture sessions. The 16 air crews did arrive over Japan from the USS Hornet (CV-8). President Franklin D. Roosevelt said the crews came from Shangri-La, a fictional place described in the 1933 novel "Lost Horizon" by British author James Hilton. The USS Shangri-La (CV-38) was commissioned in 1944. "The Purple Heart" was based on the real-life story of eight Doolittle Raiders who were captured from two different crews: Lieutenants
S-expression be formatted as pretty printed S-expressions using the function PPRINT (note: with two Ps, short for "pretty"-print). Lisp programs are valid s-expressions, but not all s-expressions are valid Lisp programs. codice_21 is a valid s-expression, but not a valid Lisp program, since Lisp uses prefix notation and a floating point number (here 1.0) is not valid as an operation (the first element of the expression). An S-expression preceded by a single quotation mark, as in codice_22, is syntactic sugar for a quoted S-expression, in this case codice_23. S-Expressions are often compared to XML, a key difference being that S-Expressions are