| line | !l | l&&!r | l&&r | condition | 
 
| 83 | 2 | 2 | 13 | ref $sub and isa($sub, 'CODE') | 
 
| 108 | 1 | 1 | 13 | ref $sub and isa($sub, 'CODE') | 
 
| 145 | 2 | 0 | 33 | ref $self and isa($self, 'Algorithm::SixDegrees') | 
 
| 171 | 1 | 1 | 28 | exists $$self{'_sources'} and isa($$self{'_sources'}, 'ARRAY') | 
 
| 187 | 1 | 1 | 37 | ref $$self{'_source_left'} and ref $$self{'_source_left'}{$source} | 
 
|  | 2 | 0 | 37 | ref $$self{'_source_left'} and ref $$self{'_source_left'}{$source} and isa($$self{'_source_left'}{$source}{'sub'}, 'CODE') | 
 
| 193 | 1 | 1 | 35 | ref $$self{'_source_right'} and ref $$self{'_source_right'}{$source} | 
 
|  | 2 | 0 | 35 | ref $$self{'_source_right'} and ref $$self{'_source_right'}{$source} and isa($$self{'_source_right'}{$source}{'sub'}, 'CODE') | 
 
| 251 | 0 | 0 | 2 | defined $la and defined $lm | 
 
|  | 0 | 0 | 2 | defined $la and defined $lm and defined $ra | 
 
|  | 0 | 0 | 2 | defined $la and defined $lm and defined $ra and defined $rm | 
 
| 365 | 61 | 19 | 0 | scalar @ids == 1 and not defined $ids[0] |