nlambda cond
nlambda progn
nlambda while
-f_lexpr print
-f_lexpr patom
+f_lexpr write
+f_lexpr display
f_lexpr plus +
f_lexpr minus -
f_lexpr times *
f_lambda stringp string?
f_lambda procedurep procedure?
lexpr apply
+f_lambda read_char read-char
+f_lambda write_char write-char
+f_lambda exit
+f_lambda current_jiffy current-jiffy
+f_lambda current_second current-second
+f_lambda jiffies_per_second jiffies-per-second