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room-and-pillar

[ room-uhn-pil-er, room- ]
/ ˈrum ənˈpɪl ər, ˈrʊm- /
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adjective Mining.
noting a means of extracting coal or other minerals from underground deposits by first cutting out rooms, then robbing the pillars between them; pillar-and-breast.
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SHALL WE PLAY A "SHALL" VS. "SHOULD" CHALLENGE?
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Question 1 of 6
Which form is used to state an obligation or duty someone has?
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