This has been fixed, not with the missing six characters, but a little application icon in the top right of your file previews. Proof that we really do go the extra time.

not A but B 为关联并列连词，应该连接相等的语法结构。but后应该加介词with。这是原作者的疏忽。

the missing six characters也是不恰当的，限定词six应该位于修饰语missing之前，而不是之后。应改为 the six missing characters.