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SELECT
Block(($x)->{
$m = Udf(Yson::MutCreate, $x as Depends)();
$m, $ok = Yson::MutTryDown($m, 'foo');
$m = Ensure($m, not $ok);
$m = Yson::MutDownOrCreate($m, 'foo');
$m = Yson::MutUpsert($m, '1'y);
$m = Yson::MutRewind($m);
$m, $ok = Yson::MutTryDown($m, 'foo');
return LinearDestroy($ok, $m);
})
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