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Inserts a 1-cell in the 2-cell containing dh1 and dh2.
Returns a handle on one dart belonging to the new 1-cell.
| Precondition: | is_insertable_cell_1_in_cell_2<Map>(cm,dh1,dh2).
See example in Figure 27.13.
If 2-attributes are non void,
Attribute_type<2>::type::On_split(a,a') is called, with a the original 2-attribute associated
with dh and a' the new 2-attribute created during the operation. |
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