问题描述：
My first letter is in "black",not in "back".My second letter is in"tell",not in "tall".
My third letter is in "five",not in"give".My fourth letter is in "ten",not in"pen".My so the word is .
My third letter is in "five",not in"give".My fourth letter is in "ten",not in"pen".My so the word is .
问题解答：
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