In this task, You are given an open-domain question that can be answered based on factual information. Your task is to provide \*short\* answer (in a few words only) for the given question. The short answer can be one or more entities or it can also be boolean \*yes\* or \*no\*.
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Question: when does ripper street start on bbc 2

Answer: 22 August 2016


Question: what does sandstone turn into under heat and pressure

Answer: quartzite


Question: when did puerto rican immigrants come to america

Answer:
mid-19th century