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设原命题为:“对顶角相等”,把它写成“若p则q”形式为________.它的逆命题为________,否命题为________,逆否命题为________.
设原命题为“对顶角相等”,把它写成“若p则q”形式为________.它的逆命题为________,否命题为________,逆否命题为________.