human
Solve the following python programming problem given the following code:
def contribute_to_class(self, cls, name) : 
    if (self.rel.symmetrical and ((self.rel.to == 'self') or (self.rel.to == cls._meta.object_name))) : 
        self.rel.related_name = ('%s_rel_+' % name) 
super (ManyToManyField, self).contribute_to_class (cls, name) 
    if ((not self.rel.through) and (not cls._meta.abstract) and (not resolve_through_model._meta.swapped)) : 
        self.rel.through = create_many_to_many_intermediary_model (self, cls) 
setattr (cls, self.name, ReverseManyRelatedObjectsDescriptor (self)) 
    self.m2m_db_table = curry (self._get_m2m_db_table, cls._meta) 
    if isinstance (self.rel.through, six.string_types) : 
        def resolve_through_model(field, model, cls) : 
            field.rel.through = model 
add_lazy_relation (cls, self, self.rel.through, resolve_through_model) 
if isinstance (self.rel.to, six.string_types) : 
        target = self.rel.to 
else : 
        target = self.rel.to._meta.db_table 
cls._meta.duplicate_targets [self.column] = (target, 'm2m') 

    
    

    Fix the buggy line: if ((not self.rel.through) and (not cls._meta.abstract) and (not resolve_through_model._meta.swapped)) :
assistant
#Here is Python program to fix the buggy line: if ((not self.

if ((not self.rel.through) and (not cls._meta.abstract) and (not cls._meta.swapped)) :