It is the purely symmetric product; therefore, it is completely commutative.

它是纯对称的积；因此，它是完全可交换的。

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Finally, the concept of commutative free product was given, and the relationship between semi-lattice free product and commutative free product was examined.

还建立了交换自由积的概念，并考察了半格自由积与交换自由积的关系。

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