$|--;
my ($a, $b, $c, $d, $m, $n) = (0,1,1,0,0,0);
while() { if($b && $d && (my $q=int($a/$b))==int($c/$d)) {
$a = 10*($a-$b*$q); $c = 10*($c-$d*$q);
print $q; } else {
$q = $a; $a = $c; $c = $c * (($m % 3) % 2 ? $n * 2 : 1) + $q;
$q = $b;
$b = $d;
$d = $d * (($m++ % 3) % 2 ? $n++ * 2 : 1) + $q; } }
# Hit control-C when it stops printing
# due to numeric overflow
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