% Mizar ND problem: t2_trees_2,trees_2,54,26 
fof(dh_c1_2__trees_2,definition,
    ( ( ( v1_relat_1(c1_2__trees_2)
        & v1_funct_1(c1_2__trees_2)
        & v1_finseq_1(c1_2__trees_2) )
     => ! [A] : 
          ( ( v1_relat_1(A)
            & v1_funct_1(A)
            & v1_finseq_1(A) )
         => ! [B] : 
              ( ( v1_relat_1(B)
                & v1_funct_1(B)
                & v1_finseq_1(B) )
             => ( ( r2_xboole_0(c1_2__trees_2,B)
                  & r1_tarski(A,B) )
               => r3_xboole_0(c1_2__trees_2,A) ) ) ) )
   => ! [C] : 
        ( ( v1_relat_1(C)
          & v1_funct_1(C)
          & v1_finseq_1(C) )
       => ! [D] : 
            ( ( v1_relat_1(D)
              & v1_funct_1(D)
              & v1_finseq_1(D) )
           => ! [E] : 
                ( ( v1_relat_1(E)
                  & v1_funct_1(E)
                  & v1_finseq_1(E) )
               => ( ( r2_xboole_0(C,E)
                    & r1_tarski(D,E) )
                 => r3_xboole_0(C,D) ) ) ) ) ),
    introduced(definition,[new_symbol(c1_2__trees_2),file(trees_2,c1_2__trees_2)]),
    [interesting(0.8),axiom,file(trees_2,c1_2__trees_2)]).

fof(dh_c2_2__trees_2,definition,
    ( ( ( v1_relat_1(c2_2__trees_2)
        & v1_funct_1(c2_2__trees_2)
        & v1_finseq_1(c2_2__trees_2) )
     => ! [A] : 
          ( ( v1_relat_1(A)
            & v1_funct_1(A)
            & v1_finseq_1(A) )
         => ( ( r2_xboole_0(c1_2__trees_2,A)
              & r1_tarski(c2_2__trees_2,A) )
           => r3_xboole_0(c1_2__trees_2,c2_2__trees_2) ) ) )
   => ! [B] : 
        ( ( v1_relat_1(B)
          & v1_funct_1(B)
          & v1_finseq_1(B) )
       => ! [C] : 
            ( ( v1_relat_1(C)
              & v1_funct_1(C)
              & v1_finseq_1(C) )
           => ( ( r2_xboole_0(c1_2__trees_2,C)
                & r1_tarski(B,C) )
             => r3_xboole_0(c1_2__trees_2,B) ) ) ) ),
    introduced(definition,[new_symbol(c2_2__trees_2),file(trees_2,c2_2__trees_2)]),
    [interesting(0.8),axiom,file(trees_2,c2_2__trees_2)]).

fof(dh_c3_2__trees_2,definition,
    ( ( ( v1_relat_1(c3_2__trees_2)
        & v1_funct_1(c3_2__trees_2)
        & v1_finseq_1(c3_2__trees_2) )
     => ( ( r2_xboole_0(c1_2__trees_2,c3_2__trees_2)
          & r1_tarski(c2_2__trees_2,c3_2__trees_2) )
       => r3_xboole_0(c1_2__trees_2,c2_2__trees_2) ) )
   => ! [A] : 
        ( ( v1_relat_1(A)
          & v1_funct_1(A)
          & v1_finseq_1(A) )
       => ( ( r2_xboole_0(c1_2__trees_2,A)
            & r1_tarski(c2_2__trees_2,A) )
         => r3_xboole_0(c1_2__trees_2,c2_2__trees_2) ) ) ),
    introduced(definition,[new_symbol(c3_2__trees_2),file(trees_2,c3_2__trees_2)]),
    [interesting(0.8),axiom,file(trees_2,c3_2__trees_2)]).

fof(e1_2__trees_2,assumption,(
    r2_xboole_0(c1_2__trees_2,c3_2__trees_2) ),
    introduced(assumption,[file(trees_2,e1_2__trees_2)]),
    [interesting(0.8),axiom,file(trees_2,e1_2__trees_2)]).

fof(rc3_finseq_1,theorem,(
    ? [A] : 
      ( v1_xboole_0(A)
      & v1_relat_1(A)
      & v1_funct_1(A)
      & v2_funct_1(A)
      & v1_finset_1(A)
      & v1_finseq_1(A) ) ),
    file(finseq_1,rc3_finseq_1),
    [interesting(0.9),axiom,file(finseq_1,rc3_finseq_1)]).

fof(rc3_relat_1,theorem,(
    ? [A] : 
      ( v1_relat_1(A)
      & v3_relat_1(A) ) ),
    file(relat_1,rc3_relat_1),
    [interesting(0.9),axiom,file(relat_1,rc3_relat_1)]).

fof(rc6_finseq_1,theorem,(
    ? [A] : 
      ( v1_xboole_0(A)
      & v1_relat_1(A)
      & v1_funct_1(A)
      & v2_funct_1(A)
      & v1_finset_1(A) ) ),
    file(finseq_1,rc6_finseq_1),
    [interesting(0.9),axiom,file(finseq_1,rc6_finseq_1)]).

fof(antisymmetry_r2_hidden,theorem,(
    ! [A,B] : 
      ( r2_hidden(A,B)
     => ~ r2_hidden(B,A) ) ),
    file(hidden,r2_hidden),
    [interesting(0.9),axiom,file(hidden,r2_hidden)]).

fof(dt_k1_xboole_0,axiom,(
    $true ),
    file(xboole_0,k1_xboole_0),
    [interesting(0.9),axiom,file(xboole_0,k1_xboole_0)]).

fof(fc12_relat_1,theorem,
    ( v1_xboole_0(k1_xboole_0)
    & v1_relat_1(k1_xboole_0)
    & v3_relat_1(k1_xboole_0) ),
    file(relat_1,fc12_relat_1),
    [interesting(0.9),axiom,file(relat_1,fc12_relat_1)]).

fof(fc1_xboole_0,theorem,(
    v1_xboole_0(k1_xboole_0) ),
    file(xboole_0,fc1_xboole_0),
    [interesting(0.9),axiom,file(xboole_0,fc1_xboole_0)]).

fof(fc2_finseq_1,theorem,
    ( v1_xboole_0(k1_xboole_0)
    & v1_relat_1(k1_xboole_0)
    & v3_relat_1(k1_xboole_0)
    & v1_funct_1(k1_xboole_0)
    & v2_funct_1(k1_xboole_0)
    & v1_finset_1(k1_xboole_0)
    & v1_finseq_1(k1_xboole_0) ),
    file(finseq_1,fc2_finseq_1),
    [interesting(0.9),axiom,file(finseq_1,fc2_finseq_1)]).

fof(fc4_relat_1,theorem,
    ( v1_xboole_0(k1_xboole_0)
    & v1_relat_1(k1_xboole_0) ),
    file(relat_1,fc4_relat_1),
    [interesting(0.9),axiom,file(relat_1,fc4_relat_1)]).

fof(t1_subset,theorem,(
    ! [A,B] : 
      ( r2_hidden(A,B)
     => m1_subset_1(A,B) ) ),
    file(subset,t1_subset),
    [interesting(0.9),axiom,file(subset,t1_subset)]).

fof(t4_subset,theorem,(
    ! [A,B,C] : 
      ( ( r2_hidden(A,B)
        & m1_subset_1(B,k1_zfmisc_1(C)) )
     => m1_subset_1(A,C) ) ),
    file(subset,t4_subset),
    [interesting(0.9),axiom,file(subset,t4_subset)]).

fof(t5_subset,theorem,(
    ! [A,B,C] : 
      ~ ( r2_hidden(A,B)
        & m1_subset_1(B,k1_zfmisc_1(C))
        & v1_xboole_0(C) ) ),
    file(subset,t5_subset),
    [interesting(0.9),axiom,file(subset,t5_subset)]).

fof(t8_boole,theorem,(
    ! [A,B] : 
      ~ ( v1_xboole_0(A)
        & A != B
        & v1_xboole_0(B) ) ),
    file(boole,t8_boole),
    [interesting(0.9),axiom,file(boole,t8_boole)]).

fof(cc1_finset_1,theorem,(
    ! [A] : 
      ( v1_xboole_0(A)
     => v1_finset_1(A) ) ),
    file(finset_1,cc1_finset_1),
    [interesting(0.9),axiom,file(finset_1,cc1_finset_1)]).

fof(cc1_relat_1,theorem,(
    ! [A] : 
      ( v1_xboole_0(A)
     => v1_relat_1(A) ) ),
    file(relat_1,cc1_relat_1),
    [interesting(0.9),axiom,file(relat_1,cc1_relat_1)]).

fof(rc1_finset_1,theorem,(
    ? [A] : 
      ( ~ v1_xboole_0(A)
      & v1_finset_1(A) ) ),
    file(finset_1,rc1_finset_1),
    [interesting(0.9),axiom,file(finset_1,rc1_finset_1)]).

fof(rc1_relat_1,theorem,(
    ? [A] : 
      ( v1_xboole_0(A)
      & v1_relat_1(A) ) ),
    file(relat_1,rc1_relat_1),
    [interesting(0.9),axiom,file(relat_1,rc1_relat_1)]).

fof(rc1_subset_1,theorem,(
    ! [A] : 
      ( ~ v1_xboole_0(A)
     => ? [B] : 
          ( m1_subset_1(B,k1_zfmisc_1(A))
          & ~ v1_xboole_0(B) ) ) ),
    file(subset_1,rc1_subset_1),
    [interesting(0.9),axiom,file(subset_1,rc1_subset_1)]).

fof(rc1_xboole_0,theorem,(
    ? [A] : v1_xboole_0(A) ),
    file(xboole_0,rc1_xboole_0),
    [interesting(0.9),axiom,file(xboole_0,rc1_xboole_0)]).

fof(rc2_relat_1,theorem,(
    ? [A] : 
      ( ~ v1_xboole_0(A)
      & v1_relat_1(A) ) ),
    file(relat_1,rc2_relat_1),
    [interesting(0.9),axiom,file(relat_1,rc2_relat_1)]).

fof(rc2_subset_1,theorem,(
    ! [A] : 
    ? [B] : 
      ( m1_subset_1(B,k1_zfmisc_1(A))
      & v1_xboole_0(B) ) ),
    file(subset_1,rc2_subset_1),
    [interesting(0.9),axiom,file(subset_1,rc2_subset_1)]).

fof(rc2_xboole_0,theorem,(
    ? [A] : ~ v1_xboole_0(A) ),
    file(xboole_0,rc2_xboole_0),
    [interesting(0.9),axiom,file(xboole_0,rc2_xboole_0)]).

fof(rc3_finset_1,theorem,(
    ! [A] : 
      ( ~ v1_xboole_0(A)
     => ? [B] : 
          ( m1_subset_1(B,k1_zfmisc_1(A))
          & ~ v1_xboole_0(B)
          & v1_finset_1(B) ) ) ),
    file(finset_1,rc3_finset_1),
    [interesting(0.9),axiom,file(finset_1,rc3_finset_1)]).

fof(rc4_finset_1,theorem,(
    ! [A] : 
      ( ~ v1_xboole_0(A)
     => ? [B] : 
          ( m1_subset_1(B,k1_zfmisc_1(A))
          & ~ v1_xboole_0(B)
          & v1_finset_1(B) ) ) ),
    file(finset_1,rc4_finset_1),
    [interesting(0.9),axiom,file(finset_1,rc4_finset_1)]).

fof(rc7_finseq_1,theorem,(
    ? [A] : 
      ( ~ v1_xboole_0(A)
      & v1_relat_1(A)
      & v1_funct_1(A)
      & v1_finset_1(A) ) ),
    file(finseq_1,rc7_finseq_1),
    [interesting(0.9),axiom,file(finseq_1,rc7_finseq_1)]).

fof(rc8_finseq_1,theorem,(
    ? [A] : 
      ( ~ v1_xboole_0(A)
      & v1_relat_1(A)
      & v1_funct_1(A)
      & v1_finset_1(A)
      & v1_finseq_1(A) ) ),
    file(finseq_1,rc8_finseq_1),
    [interesting(0.9),axiom,file(finseq_1,rc8_finseq_1)]).

fof(t2_subset,theorem,(
    ! [A,B] : 
      ( m1_subset_1(A,B)
     => ( v1_xboole_0(B)
        | r2_hidden(A,B) ) ) ),
    file(subset,t2_subset),
    [interesting(0.9),axiom,file(subset,t2_subset)]).

fof(t6_boole,theorem,(
    ! [A] : 
      ( v1_xboole_0(A)
     => A = k1_xboole_0 ) ),
    file(boole,t6_boole),
    [interesting(0.9),axiom,file(boole,t6_boole)]).

fof(t7_boole,theorem,(
    ! [A,B] : 
      ~ ( r2_hidden(A,B)
        & v1_xboole_0(B) ) ),
    file(boole,t7_boole),
    [interesting(0.9),axiom,file(boole,t7_boole)]).

fof(existence_m1_subset_1,axiom,(
    ! [A] : 
    ? [B] : m1_subset_1(B,A) ),
    file(subset_1,m1_subset_1),
    [interesting(0.9),axiom,file(subset_1,m1_subset_1)]).

fof(dt_k1_zfmisc_1,axiom,(
    $true ),
    file(zfmisc_1,k1_zfmisc_1),
    [interesting(0.9),axiom,file(zfmisc_1,k1_zfmisc_1)]).

fof(dt_m1_subset_1,axiom,(
    $true ),
    file(subset_1,m1_subset_1),
    [interesting(0.9),axiom,file(subset_1,m1_subset_1)]).

fof(cc2_finset_1,theorem,(
    ! [A] : 
      ( v1_finset_1(A)
     => ! [B] : 
          ( m1_subset_1(B,k1_zfmisc_1(A))
         => v1_finset_1(B) ) ) ),
    file(finset_1,cc2_finset_1),
    [interesting(0.9),axiom,file(finset_1,cc2_finset_1)]).

fof(fc1_subset_1,theorem,(
    ! [A] : ~ v1_xboole_0(k1_zfmisc_1(A)) ),
    file(subset_1,fc1_subset_1),
    [interesting(0.9),axiom,file(subset_1,fc1_subset_1)]).

fof(reflexivity_r1_tarski,theorem,(
    ! [A,B] : r1_tarski(A,A) ),
    file(tarski,r1_tarski),
    [interesting(0.9),axiom,file(tarski,r1_tarski)]).

fof(symmetry_r3_xboole_0,theorem,(
    ! [A,B] : 
      ( r3_xboole_0(A,B)
     => r3_xboole_0(B,A) ) ),
    file(xboole_0,r3_xboole_0),
    [interesting(0.9),axiom,file(xboole_0,r3_xboole_0)]).

fof(reflexivity_r3_xboole_0,theorem,(
    ! [A,B] : r3_xboole_0(A,A) ),
    file(xboole_0,r3_xboole_0),
    [interesting(0.9),axiom,file(xboole_0,r3_xboole_0)]).

fof(dt_c1_2__trees_2,assumption,
    ( v1_relat_1(c1_2__trees_2)
    & v1_funct_1(c1_2__trees_2)
    & v1_finseq_1(c1_2__trees_2) ),
    introduced(assumption,[file(trees_2,c1_2__trees_2)]),
    [interesting(0.8),axiom,file(trees_2,c1_2__trees_2)]).

fof(dt_c2_2__trees_2,assumption,
    ( v1_relat_1(c2_2__trees_2)
    & v1_funct_1(c2_2__trees_2)
    & v1_finseq_1(c2_2__trees_2) ),
    introduced(assumption,[file(trees_2,c2_2__trees_2)]),
    [interesting(0.8),axiom,file(trees_2,c2_2__trees_2)]).

fof(dt_c3_2__trees_2,assumption,
    ( v1_relat_1(c3_2__trees_2)
    & v1_funct_1(c3_2__trees_2)
    & v1_finseq_1(c3_2__trees_2) ),
    introduced(assumption,[file(trees_2,c3_2__trees_2)]),
    [interesting(0.8),axiom,file(trees_2,c3_2__trees_2)]).

fof(cc1_finseq_1,theorem,(
    ! [A] : 
      ( ( v1_relat_1(A)
        & v1_funct_1(A)
        & v1_finseq_1(A) )
     => ( v1_relat_1(A)
        & v1_funct_1(A)
        & v1_finset_1(A) ) ) ),
    file(finseq_1,cc1_finseq_1),
    [interesting(0.9),axiom,file(finseq_1,cc1_finseq_1)]).

fof(rc1_finseq_1,theorem,(
    ? [A] : 
      ( v1_relat_1(A)
      & v1_funct_1(A)
      & v1_finseq_1(A) ) ),
    file(finseq_1,rc1_finseq_1),
    [interesting(0.9),axiom,file(finseq_1,rc1_finseq_1)]).

fof(t3_subset,theorem,(
    ! [A,B] : 
      ( m1_subset_1(A,k1_zfmisc_1(B))
    <=> r1_tarski(A,B) ) ),
    file(subset,t3_subset),
    [interesting(0.9),axiom,file(subset,t3_subset)]).

fof(irreflexivity_r2_xboole_0,theorem,(
    ! [A,B] : ~ r2_xboole_0(A,A) ),
    file(xboole_0,r2_xboole_0),
    [interesting(0.9),axiom,file(xboole_0,r2_xboole_0)]).

fof(antisymmetry_r2_xboole_0,theorem,(
    ! [A,B] : 
      ( r2_xboole_0(A,B)
     => ~ r2_xboole_0(B,A) ) ),
    file(xboole_0,r2_xboole_0),
    [interesting(0.9),axiom,file(xboole_0,r2_xboole_0)]).

fof(d8_xboole_0,definition,(
    ! [A,B] : 
      ( r2_xboole_0(A,B)
    <=> ( r1_tarski(A,B)
        & A != B ) ) ),
    file(xboole_0,d8_xboole_0),
    [interesting(0.9),axiom,file(xboole_0,d8_xboole_0)]).

fof(e2_2__trees_2,plain,(
    r1_tarski(c1_2__trees_2,c3_2__trees_2) ),
    inference(mizar_by,[status(thm),assumptions([dt_c1_2__trees_2,dt_c3_2__trees_2,e1_2__trees_2])],[rc3_finseq_1,rc3_relat_1,rc6_finseq_1,antisymmetry_r2_hidden,dt_k1_xboole_0,fc12_relat_1,fc1_xboole_0,fc2_finseq_1,fc4_relat_1,t1_subset,t4_subset,t5_subset,cc1_finset_1,cc1_relat_1,cc2_finset_1,rc1_finset_1,rc1_relat_1,rc1_subset_1,rc1_xboole_0,rc2_relat_1,rc2_subset_1,rc2_xboole_0,rc3_finset_1,rc4_finset_1,rc7_finseq_1,rc8_finseq_1,t2_subset,t6_boole,t7_boole,t8_boole,existence_m1_subset_1,dt_k1_zfmisc_1,dt_m1_subset_1,cc1_finseq_1,fc1_subset_1,rc1_finseq_1,reflexivity_r1_tarski,irreflexivity_r2_xboole_0,antisymmetry_r2_xboole_0,dt_c1_2__trees_2,dt_c3_2__trees_2,t3_subset,e1_2__trees_2,d8_xboole_0]),
    [interesting(0.8),file(trees_2,e2_2__trees_2),[file(trees_2,e2_2__trees_2)]]).

fof(t1_trees_2,theorem,(
    ! [A] : 
      ( ( v1_relat_1(A)
        & v1_funct_1(A)
        & v1_finseq_1(A) )
     => ! [B] : 
          ( ( v1_relat_1(B)
            & v1_funct_1(B)
            & v1_finseq_1(B) )
         => ! [C] : 
              ( ( v1_relat_1(C)
                & v1_funct_1(C)
                & v1_finseq_1(C) )
             => ( ( r1_tarski(A,C)
                  & r1_tarski(B,C) )
               => r3_xboole_0(A,B) ) ) ) ) ),
    file(trees_2,t1_trees_2),
    [interesting(0.9),axiom,file(trees_2,t1_trees_2)]).

fof(e3_2__trees_2,plain,(
    ~ ( r1_tarski(c2_2__trees_2,c3_2__trees_2)
      & ~ r3_xboole_0(c1_2__trees_2,c2_2__trees_2) ) ),
    inference(mizar_by,[status(thm),assumptions([dt_c2_2__trees_2,dt_c1_2__trees_2,dt_c3_2__trees_2,e1_2__trees_2])],[rc3_finseq_1,rc3_relat_1,rc6_finseq_1,antisymmetry_r2_hidden,dt_k1_xboole_0,fc12_relat_1,fc1_xboole_0,fc2_finseq_1,fc4_relat_1,t1_subset,t4_subset,t5_subset,t8_boole,cc1_finset_1,cc1_relat_1,rc1_finset_1,rc1_relat_1,rc1_subset_1,rc1_xboole_0,rc2_relat_1,rc2_subset_1,rc2_xboole_0,rc3_finset_1,rc4_finset_1,rc7_finseq_1,rc8_finseq_1,t2_subset,t6_boole,t7_boole,existence_m1_subset_1,dt_k1_zfmisc_1,dt_m1_subset_1,cc2_finset_1,fc1_subset_1,reflexivity_r1_tarski,symmetry_r3_xboole_0,reflexivity_r3_xboole_0,dt_c1_2__trees_2,dt_c2_2__trees_2,dt_c3_2__trees_2,cc1_finseq_1,rc1_finseq_1,t3_subset,e2_2__trees_2,t1_trees_2]),
    [interesting(0.8),file(trees_2,e3_2__trees_2),[file(trees_2,e3_2__trees_2)]]).

fof(i3_2__trees_2,theorem,(
    $true ),
    introduced(tautology,[file(trees_2,i3_2__trees_2)]),
    [interesting(0.8),trivial,file(trees_2,i3_2__trees_2)]).

fof(i2_2__trees_2,plain,(
    ~ ( r1_tarski(c2_2__trees_2,c3_2__trees_2)
      & ~ r3_xboole_0(c1_2__trees_2,c2_2__trees_2) ) ),
    inference(conclusion,[status(thm),assumptions([dt_c2_2__trees_2,dt_c1_2__trees_2,dt_c3_2__trees_2,e1_2__trees_2])],[e3_2__trees_2,i3_2__trees_2]),
    [interesting(0.8),file(trees_2,i2_2__trees_2),[file(trees_2,i2_2__trees_2)]]).

fof(i1_2__trees_2,plain,
    ( ( r2_xboole_0(c1_2__trees_2,c3_2__trees_2)
      & r1_tarski(c2_2__trees_2,c3_2__trees_2) )
   => r3_xboole_0(c1_2__trees_2,c2_2__trees_2) ),
    inference(discharge_asm,[status(thm),assumptions([dt_c2_2__trees_2,dt_c1_2__trees_2,dt_c3_2__trees_2]),discharge_asm(discharge,[e1_2__trees_2])],[e1_2__trees_2,i2_2__trees_2]),
    [interesting(0.8),file(trees_2,i1_2__trees_2),[file(trees_2,i1_2__trees_2)]]).

fof(i1_2_tmp__trees_2,plain,
    ( ( v1_relat_1(c1_2__trees_2)
      & v1_funct_1(c1_2__trees_2)
      & v1_finseq_1(c1_2__trees_2)
      & v1_relat_1(c2_2__trees_2)
      & v1_funct_1(c2_2__trees_2)
      & v1_finseq_1(c2_2__trees_2)
      & v1_relat_1(c3_2__trees_2)
      & v1_funct_1(c3_2__trees_2)
      & v1_finseq_1(c3_2__trees_2) )
   => ( ( r2_xboole_0(c1_2__trees_2,c3_2__trees_2)
        & r1_tarski(c2_2__trees_2,c3_2__trees_2) )
     => r3_xboole_0(c1_2__trees_2,c2_2__trees_2) ) ),
    inference(discharge_asm,[status(thm),assumptions([]),discharge_asm(discharge,[dt_c1_2__trees_2,dt_c2_2__trees_2,dt_c3_2__trees_2])],[dt_c1_2__trees_2,dt_c2_2__trees_2,dt_c3_2__trees_2,i1_2__trees_2]),
    [interesting(1),t2_trees_2]).

fof(t2_trees_2,theorem,(
    ! [A] : 
      ( ( v1_relat_1(A)
        & v1_funct_1(A)
        & v1_finseq_1(A) )
     => ! [B] : 
          ( ( v1_relat_1(B)
            & v1_funct_1(B)
            & v1_finseq_1(B) )
         => ! [C] : 
              ( ( v1_relat_1(C)
                & v1_funct_1(C)
                & v1_finseq_1(C) )
             => ( ( r2_xboole_0(A,C)
                  & r1_tarski(B,C) )
               => r3_xboole_0(A,B) ) ) ) ) ),
    inference(let,[status(thm),assumptions([])],[i1_2_tmp__trees_2,dh_c1_2__trees_2,dh_c2_2__trees_2,dh_c3_2__trees_2]),
    [interesting(1),file(trees_2,t2_trees_2),[file(trees_2,t2_trees_2)]]).