(self, a, b, **attrs)
| 97 | ) |
| 98 | |
| 99 | def edge(self, a, b, **attrs): |
| 100 | if isinstance(a, Thread): |
| 101 | attrs.update(arrowhead='none', arrowtail='tee') |
| 102 | return self.draw_edge(a, b, self.edge_scheme, attrs) |
| 103 | |
| 104 | def subscript(n): |
| 105 | S = {'0': '₀', '1': '₁', '2': '₂', '3': '₃', '4': '₄', |