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<?php
$s = "This";
$is = "an";
$of = "a";
$ninja = "coding";
$This = "is";
$a = "ninja";
$coding = "echo";
$an = "example";
$example = "of";
${null} = ' "$s';
function z($x,$c='$'){return $x==1?$c:z($x-1,$c.'$');}
for($i=1;$i<=7;$i++){${null}.=' ${'.z($i).'s}';}
eval($$$$$$$$$s.${null}.'\n";');
/* Returns:
This is an example of a ninja coding
*/