| line | l | !l&&r | !l&&!r | condition | 
 
| 45 | 0 | 1 | 9 | not defined $self->graph or $self->graph->has_a_cycle | 
 
|  | 1 | 0 | 9 | not defined $self->graph or $self->graph->has_a_cycle or $self->graph->is_pseudo_graph | 
 
|  | 1 | 1 | 8 | not defined $self->graph or $self->graph->has_a_cycle or $self->graph->is_pseudo_graph or $self->graph->is_refvertexed | 
 
|  | 1 | 1 | 7 | not defined $self->graph or $self->graph->has_a_cycle or $self->graph->is_pseudo_graph or $self->graph->is_refvertexed or $self->graph->is_undirected | 
 
|  | 2 | 1 | 6 | not defined $self->graph or $self->graph->has_a_cycle or $self->graph->is_pseudo_graph or $self->graph->is_refvertexed or $self->graph->is_undirected or $self->graph->is_multiedged | 
 
|  | 2 | 1 | 5 | not defined $self->graph or $self->graph->has_a_cycle or $self->graph->is_pseudo_graph or $self->graph->is_refvertexed or $self->graph->is_undirected or $self->graph->is_multiedged or $self->graph->is_multivertexed |