human
Solve the following python programming problem given the following code:
def _tgrep_segmented_pattern_action(_s, _l, tokens) : 
    "
    Builds a lambda function representing a segmented pattern.

    Called for expressions like (`tgrep_expr_labeled`)::

        =s .. =v < =n

    This is a segmented pattern, a tgrep2 expression which begins with
    a node label.

    The problem is that for segemented_pattern_action (': =v < =s'),
    the first element (in this case, =v) is specifically selected by
    virtue of matching a particular node in the tree.
to retrieve
    the node, we need the label, not a lambda function.  For node
    labels inside a tgrep_node_expr, we need a lambda function which
    returns true if the node visited is the same as =v.

    We solve this by creating two copies of a node_label_use in the
    grammar.
the label use inside a tgrep_expr_labeled has a separate
    parse action to the pred use inside a node_expr.  See
    `_tgrep_node_label_use_action` and
    `_tgrep_node_label_pred_use_action`.
    " 
    node_label = tokens [0] 
    reln_preds = tokens [1 :] 
    def pattern_segment_pred(n, m = None, l = None) : 
        'This predicate function ignores its node argument.' 
        if ((l is None) or (node_label not in l)) : 
            raise TgrepException ('node_label ={0} not bound in pattern'.format (node_label)) 
node = l [node_label] 
        return all ((pred (node, m, l) for pred in reln_preds)) 
return <MASK> 
    
    Given the code above, what is a proper replacement for <MASK>? Choose among: _s, tokens, _l, node_label, reln_preds
assistant
#Here is a proper replacement for <MASK>.
def pattern_segment_pred(