You are asked to perform a 1-back test of your working memory. You will see a sequence of letters. Compare the current letter to the letter one letter ago. Respond with ‘+’ (no quotation marks, just the plus sign) if the two letters are identical, and respond ‘-’ (no quotation marks, just the minus sign) otherwise. Only ‘+’ and ‘-’ are allowed responses. No explanations are allowed; please don’t output any extra words. The sequence will be presented one letter at a time. Now begins the task.

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