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cond

Another conditional procedure in Scheme is cond: 

(cond (test-expression-1 result-expression-sequence-1)
      (test-expression-2 result-expression-sequence-2)
      …
      (test-expression-n result-expression-sequence-n))

For example: 

guile> (define a 6)
guile> (define b 8)
guile> (cond ((< a b) "a is less than b")
...          ((= a b) "a equals b")
...          ((> a b) "a is greater than b"))
"a is less than b"

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Extending LilyPond v2.25.21 (development-branch).