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<DIV>>class list_node{</DIV>
<DIV>> var
$next;<BR>>
var
$back;<BR>>
var $serial;<BR>>
function list_node($serial,
$next){<BR>>
$this->serial =
$serial;<BR>>
$this->next =
$next;<BR>>
$this->back =
0;<BR>>
if($next !=
0){<BR>>
$this->next->back =
$this;<BR>>
}<BR>>
}<BR>> }<BR>> class
ListStr{<BR>>
var
$head;<BR>>
var
$last;<BR>>
function
InsertHead($serial){<BR>>
if((int)$serial !=
0){<BR>>
$this->head = new list_node($serial,
$this->head);<BR>>
if($this->head->next ==
0){<BR>>
$this->last =
$this->head;<BR>>
}<BR>>
}<BR>>
}<BR>> }</DIV>
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