1) Floats
2) Strings
3) Vectors
4) Tail recursion
5) Garbage collection
6) Delays

f acos
f angle
f asin
f atan

  call-with-current-continuation
  call-with-input-file
  call-with-output-file
  call/cc
  case
  catch
f ceiling
  char->integer
  char-alphabetic?
  char-ci<=?
  char-ci<?
  char-ci=?
  char-ci>=?
  char-ci>?
  char-downcase
  char-lower-case?
  char-numeric?
  char-ready
  char-ready?
  char-upcase
  char-upper-case?
  char-whitespace?
  char<=?
  char<?
  char=?
  char>=?
  char>?
  char?
  close-input-port
  close-output-port
  complex?
f cos
  current-input-port
  current-output-port

  delay
f denominator
  do

  #e
  eof-object?
f exact->inexact
f exact?
f exactness
f exp

f floor
  force

  #i
  imag-part
f inexact-exact
f inexact?
  input-port?
f int
  integer->char

s list->string
v list->vector
  load
f log

f magnitude
f make-polar
f make-rectangular
s make-string
v make-vector

s number->string
f numerator

  open-input-file
  open-output-file
  output-port?

f polar

f rational?
f rationalize
  read-char
f real-part
f real?
  return
f round

f sin
f sqrt
s string->list
s string->number
s string->symbol
s string-append
s string-ci<=?
s string-ci<?
s string-ci=?
s string-ci>=?
s string-ci>?
s string-copy
s string-fill!
s string-length
s string-ref
s string-set!
s string<=?
s string<?
s string=?
s string>=?
s string>?
s string?
s substring
s symbol->string

f tan
  transcript-off
  transcript-on
  truncate

v vector
v vector->list
v vector-fill!
v vector-length
v vector-ref
v vector-set!
v vector?

  with-input-from-file
  with-output-to-file
  write-char
