#12834: Modify subs so that it can accept multiple equations just like subs_expr
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       Reporter:  JoalHeagney        |        Owner:  AlexGhitza
           Type:  enhancement        |       Status:  needs_work
       Priority:  minor              |    Milestone:  sage-6.4
      Component:  symbolics          |   Resolution:
       Keywords:  subs algebra       |    Merged in:
  solving                            |    Reviewers:  Vincent Delecroix,
        Authors:  Michael Orlitzky,  |  Michael Orlitzky
  Vincent Delecroix                  |  Work issues:
Report Upstream:  N/A                |       Commit:
         Branch:                     |  e195b36b27caeeebcb6f2e69f90b048a9e5b9d51
  u/mjo/ticket/12834                 |     Stopgaps:
   Dependencies:                     |
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Comment (by vdelecroix):

 And looking at your last commit {{{k2 in d1.keys()}}} is O(n) in the worst
 case whereas {{{k2 in d1}}} is a lookup in a hash table.

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Ticket URL: <http://trac.sagemath.org/ticket/12834#comment:29>
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