author | nipkow |
Wed, 06 Aug 2008 13:57:25 +0200 | |
changeset 27760 | 3aa86edac080 |
parent 27138 | 63fdfcf6c7a3 |
child 29234 | 60f7fb56f8cd |
permissions | -rw-r--r-- |
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(* |
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ID: $Id$ |
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Author: Jeremy Dawson and Gerwin Klein, NICTA |
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consequences of type definition theorems, |
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and of extended type definition theorems |
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*) |
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header {* Type Definition Theorems *} |
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theory TdThs |
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imports Main |
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begin |
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section "More lemmas about normal type definitions" |
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lemma |
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tdD1: "type_definition Rep Abs A \<Longrightarrow> \<forall>x. Rep x \<in> A" and |
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tdD2: "type_definition Rep Abs A \<Longrightarrow> \<forall>x. Abs (Rep x) = x" and |
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tdD3: "type_definition Rep Abs A \<Longrightarrow> \<forall>y. y \<in> A \<longrightarrow> Rep (Abs y) = y" |
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by (auto simp: type_definition_def) |
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lemma td_nat_int: |
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"type_definition int nat (Collect (op <= 0))" |
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unfolding type_definition_def by auto |
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context type_definition |
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begin |
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lemmas Rep' [iff] = Rep [simplified] (* if A is given as Collect .. *) |
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declare Rep_inverse [simp] Rep_inject [simp] |
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lemma Abs_eqD: "Abs x = Abs y ==> x \<in> A ==> y \<in> A ==> x = y" |
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by (simp add: Abs_inject) |
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lemma Abs_inverse': |
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"r : A ==> Abs r = a ==> Rep a = r" |
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by (safe elim!: Abs_inverse) |
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lemma Rep_comp_inverse: |
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"Rep o f = g ==> Abs o g = f" |
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using Rep_inverse by (auto intro: ext) |
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lemma Rep_eqD [elim!]: "Rep x = Rep y ==> x = y" |
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by simp |
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lemma Rep_inverse': "Rep a = r ==> Abs r = a" |
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by (safe intro!: Rep_inverse) |
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lemma comp_Abs_inverse: |
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"f o Abs = g ==> g o Rep = f" |
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using Rep_inverse by (auto intro: ext) |
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lemma set_Rep: |
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"A = range Rep" |
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proof (rule set_ext) |
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fix x |
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show "(x \<in> A) = (x \<in> range Rep)" |
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by (auto dest: Abs_inverse [of x, symmetric]) |
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qed |
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lemma set_Rep_Abs: "A = range (Rep o Abs)" |
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proof (rule set_ext) |
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fix x |
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show "(x \<in> A) = (x \<in> range (Rep o Abs))" |
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by (auto dest: Abs_inverse [of x, symmetric]) |
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qed |
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lemma Abs_inj_on: "inj_on Abs A" |
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unfolding inj_on_def |
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by (auto dest: Abs_inject [THEN iffD1]) |
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lemma image: "Abs ` A = UNIV" |
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by (auto intro!: image_eqI) |
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lemmas td_thm = type_definition_axioms |
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lemma fns1: |
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"Rep o fa = fr o Rep | fa o Abs = Abs o fr ==> Abs o fr o Rep = fa" |
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by (auto dest: Rep_comp_inverse elim: comp_Abs_inverse simp: o_assoc) |
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lemmas fns1a = disjI1 [THEN fns1] |
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lemmas fns1b = disjI2 [THEN fns1] |
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lemma fns4: |
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"Rep o fa o Abs = fr ==> |
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Rep o fa = fr o Rep & fa o Abs = Abs o fr" |
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by (auto intro!: ext) |
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end |
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interpretation nat_int: type_definition [int nat "Collect (op <= 0)"] |
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by (rule td_nat_int) |
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declare |
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nat_int.Rep_cases [cases del] |
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nat_int.Abs_cases [cases del] |
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nat_int.Rep_induct [induct del] |
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nat_int.Abs_induct [induct del] |
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subsection "Extended form of type definition predicate" |
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lemma td_conds: |
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"norm o norm = norm ==> (fr o norm = norm o fr) = |
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(norm o fr o norm = fr o norm & norm o fr o norm = norm o fr)" |
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apply safe |
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apply (simp_all add: o_assoc [symmetric]) |
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apply (simp_all add: o_assoc) |
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done |
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lemma fn_comm_power: |
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"fa o tr = tr o fr ==> fa ^ n o tr = tr o fr ^ n" |
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apply (rule ext) |
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apply (induct n) |
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apply (auto dest: fun_cong) |
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done |
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lemmas fn_comm_power' = |
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ext [THEN fn_comm_power, THEN fun_cong, unfolded o_def, standard] |
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locale td_ext = type_definition + |
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fixes norm |
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assumes eq_norm: "\<And>x. Rep (Abs x) = norm x" |
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begin |
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lemma Abs_norm [simp]: |
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"Abs (norm x) = Abs x" |
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using eq_norm [of x] by (auto elim: Rep_inverse') |
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lemma td_th: |
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"g o Abs = f ==> f (Rep x) = g x" |
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by (drule comp_Abs_inverse [symmetric]) simp |
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lemma eq_norm': "Rep o Abs = norm" |
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by (auto simp: eq_norm intro!: ext) |
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lemma norm_Rep [simp]: "norm (Rep x) = Rep x" |
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by (auto simp: eq_norm' intro: td_th) |
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lemmas td = td_thm |
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lemma set_iff_norm: "w : A <-> w = norm w" |
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by (auto simp: set_Rep_Abs eq_norm' eq_norm [symmetric]) |
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lemma inverse_norm: |
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"(Abs n = w) = (Rep w = norm n)" |
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apply (rule iffI) |
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apply (clarsimp simp add: eq_norm) |
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apply (simp add: eq_norm' [symmetric]) |
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done |
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lemma norm_eq_iff: |
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"(norm x = norm y) = (Abs x = Abs y)" |
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by (simp add: eq_norm' [symmetric]) |
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lemma norm_comps: |
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"Abs o norm = Abs" |
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"norm o Rep = Rep" |
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"norm o norm = norm" |
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by (auto simp: eq_norm' [symmetric] o_def) |
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lemmas norm_norm [simp] = norm_comps |
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lemma fns5: |
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"Rep o fa o Abs = fr ==> |
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fr o norm = fr & norm o fr = fr" |
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by (fold eq_norm') (auto intro!: ext) |
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(* following give conditions for converses to td_fns1 |
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the condition (norm o fr o norm = fr o norm) says that |
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fr takes normalised arguments to normalised results, |
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(norm o fr o norm = norm o fr) says that fr |
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takes norm-equivalent arguments to norm-equivalent results, |
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(fr o norm = fr) says that fr |
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takes norm-equivalent arguments to the same result, and |
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(norm o fr = fr) says that fr takes any argument to a normalised result |
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*) |
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lemma fns2: |
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"Abs o fr o Rep = fa ==> |
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(norm o fr o norm = fr o norm) = (Rep o fa = fr o Rep)" |
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apply (fold eq_norm') |
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apply safe |
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prefer 2 |
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apply (simp add: o_assoc) |
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apply (rule ext) |
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apply (drule_tac x="Rep x" in fun_cong) |
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apply auto |
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done |
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lemma fns3: |
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"Abs o fr o Rep = fa ==> |
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(norm o fr o norm = norm o fr) = (fa o Abs = Abs o fr)" |
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apply (fold eq_norm') |
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apply safe |
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prefer 2 |
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apply (simp add: o_assoc [symmetric]) |
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apply (rule ext) |
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apply (drule fun_cong) |
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apply simp |
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done |
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lemma fns: |
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"fr o norm = norm o fr ==> |
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(fa o Abs = Abs o fr) = (Rep o fa = fr o Rep)" |
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apply safe |
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apply (frule fns1b) |
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prefer 2 |
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apply (frule fns1a) |
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apply (rule fns3 [THEN iffD1]) |
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prefer 3 |
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apply (rule fns2 [THEN iffD1]) |
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apply (simp_all add: o_assoc [symmetric]) |
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apply (simp_all add: o_assoc) |
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done |
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lemma range_norm: |
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"range (Rep o Abs) = A" |
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by (simp add: set_Rep_Abs) |
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end |
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lemmas td_ext_def' = |
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td_ext_def [unfolded type_definition_def td_ext_axioms_def] |
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end |
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