exhibit 2. 4 execution version certain identified information has been excluded from this exhibit because it is both ( i ) not material and ( ii ) the type that the registrant treats as private or confidential. the following symbol is included in this exhibit to indicate where information has been omitted : [ * * * ]. second amended and restated limited liability company agreement of cf industries nitrogen, llc effective as of december 18, 2015 table of contents pagearticle i definitions2article ii [ reserved. ] 8article iii the limited liability company83. 1formation83. 2name83. 3effective date and term ; conditions to obligations of all members83. 4registered agent and office83. 5principal office83. 6purpose and limitation on activities83. 7title to property93. 8limitations on the company ’ s activities9article iv members94. 1members94. 2membership interests94. 3additional members104. 4no withdrawal by members114. 5meetings of members114. 6telephonic conference meeting114. 7action without a meeting124. 8waiver of notice through attendance124. 9actions requiring board approval and member consent12article v capital contributions and capital accounts125. 1chs capital contribution125. 2closing conditions135. 3initial capital contributions of cfs135. 4additional capital contributions145. 5capital withdrawal rights ; cfs obligations145. 6return of contributions145. 7maintenance of capital accounts155. 8loans from members15article vi allocations and distributions156. 1allocations of net profits and net losses156. 2special allocations166. 3capital account determinations166. 4distributions166. 5distributions other than cash176. 6amounts withheld186. 7no right to receive distributions186. 8capital account restoration18 pagearticle i definitions2article ii [ reserved. ] 8article iii the limited liability company83. 1formation83. 2name83. 3effective date and term ; conditions to obligations of all members83. 4registered agent and