What are the conditions for the formation of a covalent bond according to the Lewis dot structure?

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(N/A) $1$. Each covalent bond is formed as a result of the sharing of an electron pair between the atoms.
$2$. Each combining atom contributes at least one electron to the shared pair.
$3$. The combining atoms attain the outer shell noble gas configuration (octet or duplet) as a result of the sharing of electrons.

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