I need your help please. How can I typeset this set (in the picture blew) in Latex. I even failed to write an attempt. I appreciate your help. Thanks in advance.
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{1}following\begin{array}mean ?. – Hussein Eid Oct 06 '16 at 12:34{l}(that's an "ell", not a "one") means align the lines to the left. – barbara beeton Oct 06 '16 at 12:42