You are asked to perform a 1-back test of your working memory. You will see a sequence of letters. Your task is to respond with ‘+’ (no quotation marks, just the plus sign) whenever the current letter is the same letter as one letter prior in the sequence, and ‘-’ (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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