by metal atoms such as Cr, Ti, Pd, Ni, Al except for gold, shows that nanoscale holes were etched in the structure due to interactions of metal atoms with graphene. The nanoholes were observed at room temperature in ultrahigh vacuum ($6 \times 10^{-9}~mbar$) under low-energy $60~keV$ (lower than the threshold ’knock-on’ energy $86~meV$ for a carbon atom [@sl01] in graphene) that electron-beam scanning acts as catalysts for etching holes on the graphene surface. Instead, the mending and filling of many-vacancy holes (over 100 vacancies) was observed [@zrbn12] in room-temperature metal-catalyzed etching STEM experiments under the same conditions described above, provided a reservoir of loose carbon atoms is readily available nearby holes. This process was interpreted by the authors as a dislodging of carbon adatoms from the graphene surface by the scanning electron-beam and dragging them to the edge of the holes, which results in refilling the holes by random combination of 5, 6, 7, and 8 carbon atom rings. Healing effect in graphene, where the vacancies were produced by employing plasma bombardment [@cscx13], has been performed by thermal annealing without external carbon atoms source in the temperature interval starting from $300^{\circ}C$ up to $900^{\circ}C$. For higher temperatures the self-repairing was 