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'      taggen-2.scm - Functions that generate single and double tags.Lecture 4 - slide 27 : 34
Program 2

(define (single-tag name attributes)
 (start-tag name attributes))

(define (double-tag name contents attributes)
 (string-append (start-tag name attributes)
                (as-string contents)
                (end-tag name)))