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sub h{
#23456789_123456789_123456789_123456789_1234
eval'['.('map{[@$_,1],[@$_,-1]}'x pop).'[]]'
}

sub h{
#23456789_123456789_123456789_123456789_123
[eval(('map{[@$_,1],[@$_,-1]}'x pop).'[]')]
}

sub h{
#23456789_123456789_123456789_123456789
[eval'map{[@$_,1],[@$_,-1]}'x pop.'[]']
}

sub h{
#23456789_123456789_123456789_123456789_
[eval'map{[@$_,1],[@$_,-1]}'x$_[0].'[]']
}