當集合s中的元素都為自然數，且滿足命題“如果x屬於s，則8-x屬於s”時，請問1滿足上述條件的集合s共有多當集合s中的元素都為自然數，且滿足命題“如果x屬於s，則8-x屬於s”時，請問1滿足上述條件的集合s共有多少個，請全部寫出！不懂一樓的回答

{0,8}
{1,7}
{2,6}
{3,5}
{4}
{0,1,7,8}
{0,2,6,8}
{0,3,5,8}
{0,4,8}
{1,2,6,7}
{1,3,5,7}
{1,4,7}
{2,3,5,6}
{2,4,6}
{3,4,5}
{0,1,2,6,7,8}
{0,1,3,5,7,8}
{0,1,4,7,8}
{0,2,3,5,6,8}
{0,2,4,6,8}
{0,3,4,5,8}
{1,2,3,5,6,7}
{1,2,4,6,7}
{1,3,4,5,7}
{2,3,4,5,6}
{0,1,2,3,5,6,7,8}
{0,1,2,4,6,7,8}
{0,1,3,4,5,7,8}
{0,2,3,4,5,6,8}
{1,2,3,4,5,6,7}
{0,1,2,3,4,5,6,7,8}

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