Play audio slide show -- Keyboard shortcut: 'x'  Back to slide -- Keyboard shortcut: 'u'  previous -- Keyboard shortcut: 'p'  next -- Keyboard shortcut: 'n'  Annotated program -- Keyboard shortcut: 't'      number-interval-dialogue - A sample dialogue with the number interval functions.Lecture 3 - slide 21 : 42
Program 2

1> (number-interval 1 10)
(1 2 3 4 5 6 7 8 9 10)

2> (number-interval-iter 10 20)
(10 11 12 13 14 15 16 17 18 19 20)

3> (number-interval-iter 20 10)
()