How many pairs of positively correlated genes are both non-essential?
If Expression_Corr > 0, it means the expression correlation is positive
SELECT COUNT(T2.GeneID2) FROM Genes AS T1 INNER JOIN Interactions AS T2 ON T1.GeneID = T2.GeneID1 WHERE T2.Expression_Corr > 0 AND T1.Essential = 'Non-Essential'