File: test15.5.ott

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% test15.5.ott   is_v test
% simple subrule transitive closure

  grammar

    a :: 'a_' ::= 
      | AAA          :: :: AAA
      | AA           :: :: AA
      | A a          :: :: a
      | B a a' av     :: :: B
      | C a a' av     :: :: C
    av :: 'av_' ::= 
      | AA              :: :: AA
      | A a             :: :: a
      | B av avv avv'    :: :: B
      | C a a' av        :: :: C


    avv :: 'avv_' ::= 
      | A a             :: :: a
      | B avv avv' avv''   :: :: B
      | C av avv' avv''    :: :: C

subrules
  av <:: a
  avv <:: av