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<?php declare(strict_types=1);
//require 'chapter_1.php';
/* Chapter 2 */
function is_lat
(array $l) : bool
|| (is_atom(car($l)) && is_lat(cdr($l)));
function is_member
($s, array $l) : bool
is_nulll($l) ? FALSE
: is_eq($s, car($l)) || is_member($s, cdr($l));
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