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    sub P{
    [@_],map{my$i=$_;map$$_[0]>$i?():[$i,@$_],P($_[0]-$i)}1..$_[0]-1
    }
    
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    sub P{
    my$i;[@_],map{map$$_[0]>$i?():[$i,@$_],P($_[0]-++$i)}2..$_[0]
    }