题目内容：
Questions 50-52 refer to the following letter. NOTICE TO ALL EMPLOYEES The following changes will be effective as of Monday. First of all, the dress code is changing slightly. You may still wear the ______ black pants and skirts as before along with the company shirt. However, employees are no longer allowed to wear shoes with heels higher than two inches.
(a) pair (b) same (c) kind (d) both
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