grain boundary, a dislocation or a sample edge (which can be considered as an extended defect) or coalesce with other vacancies, forming poly-vacancies with lower energy and magnetic moment. We show that a merging of a single vacancy with polyvacancies, resulting in defect cluster or hole with bigger size, is energetically favorable. According to our calculations the formation energy of a even-fold vacancy like di- or tetra-vacancy is lower than old-fold vacancies. Therefore, they are more stable. Magnetic moments of the clusters with minimal formation energies are lower too. The magnetic moment of the graphene is determined by edge structure of the vacancy clusters. So that only that defect on the e.g. A sublattice that has no counterpart on the B sublattice will contribute to the magnetization. The authors of Ref. \[\] considered a hole of $N>1$ multiple vacancies, concluded that the dangling bonds these structural defect is proportional to the circumference of the hole or to $\sqrt{N}$, and therefore its formation energy is also proportional to $\sqrt{N}$. In contrast we show that a multiple vacancy hole is structured in different modifications, and at least one of them possesses minimal dangling bonds and, consequently minimal magnetic moment. Thus, there is 