Invincible Shield

Greed has an invincible shield due to which the attacks of Edward would not work on him. But Edward being a prodigy has caught onto the flaws in Greed's shield. The shield is made up of the same fundamental element, by which all other life forms are formed, Carbon. He observed that Greed's shield can be represented as a grid $G$ of carbon clusters with $N$ rows and $M$ columns. Each cell on t