Problems Description
<span style="color:#336699;font-family:'Times New Roman';font-size:18px;line-height:28px;background-color:#BBD8E9;">两items差为2的素数称之为孪生素数。现在输入整数n,求n以内的所有孪生素数对。</span>
Input格式
<span style="color:#336699;font-family:'Times New Roman';font-size:18px;line-height:28px;background-color:#BBD8E9;">一行：一items整数n (3<n<10000)</span>
Output格式
<span style="color:#336699;font-family:'Times New Roman';font-size:18px;line-height:28px;background-color:#BBD8E9;">若干行，每一行为一对相差为2的素数</span>
Sample
Sample Input 1
10
Sample Output 1
3 5
5 7
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