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+---
+
+title: SICP exercise 3.19
+
+date: 2021-09-02
+
+---
+
+Some content here, before:
+
+```scheme
+(define (cycle? l)
+  (define (rec l x)
+    (cond
+      ((null? x) false)
+      ((eq? l x) true)
+      (true (rec l (cdr x)))))
+  (rec l (cdr l)))
+```
+
+Sample interactive session:
+
+```scheme
+scheme@(guile-user)> (define true #t)
+scheme@(guile-user)> (define false #f)
+scheme@(guile-user)>
+(define (cycle? l)
+  (define (rec l x)
+    (cond
+      ((null? x) false)
+      ((eq? l x) true)
+      (true (rec l (cdr x)))))
+  (rec l (cdr l)))
+scheme@(guile-user)> (cycle? '(1 2 3))
+$9 = #f
+scheme@(guile-user)> (cycle? (make-cycle '(1 2 3)))
+$10 = #t
+```
+
+# An h1
+
+a list:
+
+1. one
+2. two
+3. three
+
+some content.
+
+- item
+- another
+- yet another
+
+## An h2
+
+Xablau:
+
+``` xupliu 1
+
+3 4
+
+
+
+
+
+dez ```
+
+Foi `wikiwiu`.
+
+a very long code block:
+
+```
+wef
+wef               wef            wef       wef
+wef                                                   wef       wef wef we fwef                wef wef wef            wef 
+```
+
+Someone said:
+
+> Xablau, xupliu.
+
+### A repeated header ### A repeated header
+
+a big list:
+
+1. a
+1. a
+1. a
+1. a
+1. a
+1. a
+1. a
+1. a
+1. a
+1. a
+1. a
+1. a
+1. a
+1. a
+1. a
+1. a
+1. a
+1. a