of coordinates of $\mathbf{E}(\mathbf{H})$. This set may be expressed in a more compact way as

$\mathtt{s}=\{({i}_{0}\text{,}{j}_{0})\text{,}({i}_{1}\text{,}{j}_{1})\text{,}\dots \text{,}({i}_{h-1}\text{,}{j}_{h-1})\text{,}({i}_{0}\text{,}{j}_{0})\}\text{,}$ (30)

(30)

such that ${i}_{z}\ne {i}_{z+1}\text{,}{j}_{z}\ne {j}_{z+1}$, and ${a}_{{i}_{z}\text{,}{j}_{z}}\ne -1$ for all $z\in \{0\text{,}\dots \text{,}h-1\}$. Note that the converse is not necessarily true, i.e., an ...

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