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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
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