\[\large { a }^{ 4 }+{ b }^{ 4 }+{ c }^{ 4 }+abc\left( a+b+c \right) \ge k{ \left( ab+bc+ca \right) }^{ 2 }\]

Find the maximum value of \(k\) such that the inequality above holds true with all real values of \(a,\) \(b,\) and \(c.\)

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