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Type | Label | Description |
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Statement | ||
Theorem | suplubti 7001* | A supremum is the least upper bound. See also supclti 6999 and supubti 7000. (Contributed by Jim Kingdon, 24-Nov-2021.) |
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Theorem | suplub2ti 7002* | Bidirectional form of suplubti 7001. (Contributed by Jim Kingdon, 17-Jan-2022.) |
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Theorem | supelti 7003* | Supremum membership in a set. (Contributed by Jim Kingdon, 16-Jan-2022.) |
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Theorem | sup00 7004 | The supremum under an empty base set is always the empty set. (Contributed by AV, 4-Sep-2020.) |
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Theorem | supmaxti 7005* | The greatest element of a set is its supremum. Note that the converse is not true; the supremum might not be an element of the set considered. (Contributed by Jim Kingdon, 24-Nov-2021.) |
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Theorem | supsnti 7006* | The supremum of a singleton. (Contributed by Jim Kingdon, 26-Nov-2021.) |
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Theorem | isotilem 7007* | Lemma for isoti 7008. (Contributed by Jim Kingdon, 26-Nov-2021.) |
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Theorem | isoti 7008* | An isomorphism preserves tightness. (Contributed by Jim Kingdon, 26-Nov-2021.) |
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Theorem | supisolem 7009* | Lemma for supisoti 7011. (Contributed by Mario Carneiro, 24-Dec-2016.) |
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Theorem | supisoex 7010* | Lemma for supisoti 7011. (Contributed by Mario Carneiro, 24-Dec-2016.) |
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Theorem | supisoti 7011* | Image of a supremum under an isomorphism. (Contributed by Jim Kingdon, 26-Nov-2021.) |
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Theorem | infeq1 7012 | Equality theorem for infimum. (Contributed by AV, 2-Sep-2020.) |
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Theorem | infeq1d 7013 | Equality deduction for infimum. (Contributed by AV, 2-Sep-2020.) |
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Theorem | infeq1i 7014 | Equality inference for infimum. (Contributed by AV, 2-Sep-2020.) |
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Theorem | infeq2 7015 | Equality theorem for infimum. (Contributed by AV, 2-Sep-2020.) |
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Theorem | infeq3 7016 | Equality theorem for infimum. (Contributed by AV, 2-Sep-2020.) |
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Theorem | infeq123d 7017 | Equality deduction for infimum. (Contributed by AV, 2-Sep-2020.) |
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Theorem | nfinf 7018 | Hypothesis builder for infimum. (Contributed by AV, 2-Sep-2020.) |
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Theorem | cnvinfex 7019* | Two ways of expressing existence of an infimum (one in terms of converse). (Contributed by Jim Kingdon, 17-Dec-2021.) |
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Theorem | cnvti 7020* | If a relation satisfies a condition corresponding to tightness of an apartness generated by an order, so does its converse. (Contributed by Jim Kingdon, 17-Dec-2021.) |
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Theorem | eqinfti 7021* | Sufficient condition for an element to be equal to the infimum. (Contributed by Jim Kingdon, 16-Dec-2021.) |
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Theorem | eqinftid 7022* | Sufficient condition for an element to be equal to the infimum. (Contributed by Jim Kingdon, 16-Dec-2021.) |
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Theorem | infvalti 7023* | Alternate expression for the infimum. (Contributed by Jim Kingdon, 17-Dec-2021.) |
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Theorem | infclti 7024* | An infimum belongs to its base class (closure law). See also inflbti 7025 and infglbti 7026. (Contributed by Jim Kingdon, 17-Dec-2021.) |
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Theorem | inflbti 7025* | An infimum is a lower bound. See also infclti 7024 and infglbti 7026. (Contributed by Jim Kingdon, 18-Dec-2021.) |
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Theorem | infglbti 7026* | An infimum is the greatest lower bound. See also infclti 7024 and inflbti 7025. (Contributed by Jim Kingdon, 18-Dec-2021.) |
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Theorem | infnlbti 7027* | A lower bound is not greater than the infimum. (Contributed by Jim Kingdon, 18-Dec-2021.) |
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Theorem | infminti 7028* | The smallest element of a set is its infimum. Note that the converse is not true; the infimum might not be an element of the set considered. (Contributed by Jim Kingdon, 18-Dec-2021.) |
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Theorem | infmoti 7029* |
Any class ![]() ![]() ![]() |
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Theorem | infeuti 7030* | An infimum is unique. (Contributed by Jim Kingdon, 19-Dec-2021.) |
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Theorem | infsnti 7031* | The infimum of a singleton. (Contributed by Jim Kingdon, 19-Dec-2021.) |
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Theorem | inf00 7032 | The infimum regarding an empty base set is always the empty set. (Contributed by AV, 4-Sep-2020.) |
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Theorem | infisoti 7033* | Image of an infimum under an isomorphism. (Contributed by Jim Kingdon, 19-Dec-2021.) |
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Theorem | supex2g 7034 | Existence of supremum. (Contributed by Jeff Madsen, 2-Sep-2009.) |
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Theorem | infex2g 7035 | Existence of infimum. (Contributed by Jim Kingdon, 1-Oct-2024.) |
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Theorem | ordiso2 7036 | Generalize ordiso 7037 to proper classes. (Contributed by Mario Carneiro, 24-Jun-2015.) |
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Theorem | ordiso 7037* | Order-isomorphic ordinal numbers are equal. (Contributed by Jeff Hankins, 16-Oct-2009.) (Proof shortened by Mario Carneiro, 24-Jun-2015.) |
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Syntax | cdju 7038 | Extend class notation to include disjoint union of two classes. |
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Definition | df-dju 7039 |
Disjoint union of two classes. This is a way of creating a class which
contains elements corresponding to each element of ![]() ![]() ![]() ![]() |
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Theorem | djueq12 7040 | Equality theorem for disjoint union. (Contributed by Jim Kingdon, 23-Jun-2022.) |
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Theorem | djueq1 7041 | Equality theorem for disjoint union. (Contributed by Jim Kingdon, 23-Jun-2022.) |
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Theorem | djueq2 7042 | Equality theorem for disjoint union. (Contributed by Jim Kingdon, 23-Jun-2022.) |
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Theorem | nfdju 7043 | Bound-variable hypothesis builder for disjoint union. (Contributed by Jim Kingdon, 23-Jun-2022.) |
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Theorem | djuex 7044 | The disjoint union of sets is a set. See also the more precise djuss 7071. (Contributed by AV, 28-Jun-2022.) |
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Theorem | djuexb 7045 | The disjoint union of two classes is a set iff both classes are sets. (Contributed by Jim Kingdon, 6-Sep-2023.) |
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In this section, we define the left and right injections of a disjoint union
and prove their main properties. These injections are restrictions of the
"template" functions inl and inr, which appear in most applications
in the form | ||
Syntax | cinl 7046 | Extend class notation to include left injection of a disjoint union. |
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Syntax | cinr 7047 | Extend class notation to include right injection of a disjoint union. |
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Definition | df-inl 7048 | Left injection of a disjoint union. (Contributed by Mario Carneiro, 21-Jun-2022.) |
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Definition | df-inr 7049 | Right injection of a disjoint union. (Contributed by Mario Carneiro, 21-Jun-2022.) |
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Theorem | djulclr 7050 | Left closure of disjoint union. (Contributed by Jim Kingdon, 21-Jun-2022.) (Revised by BJ, 6-Jul-2022.) |
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Theorem | djurclr 7051 | Right closure of disjoint union. (Contributed by Jim Kingdon, 21-Jun-2022.) (Revised by BJ, 6-Jul-2022.) |
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Theorem | djulcl 7052 | Left closure of disjoint union. (Contributed by Jim Kingdon, 21-Jun-2022.) |
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Theorem | djurcl 7053 | Right closure of disjoint union. (Contributed by Jim Kingdon, 21-Jun-2022.) |
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Theorem | djuf1olem 7054* | Lemma for djulf1o 7059 and djurf1o 7060. (Contributed by BJ and Jim Kingdon, 4-Jul-2022.) |
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Theorem | djuf1olemr 7055* |
Lemma for djulf1or 7057 and djurf1or 7058. For a version of this lemma with
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Theorem | djulclb 7056 | Left biconditional closure of disjoint union. (Contributed by Jim Kingdon, 2-Jul-2022.) |
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Theorem | djulf1or 7057 | The left injection function on all sets is one to one and onto. (Contributed by BJ and Jim Kingdon, 22-Jun-2022.) |
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Theorem | djurf1or 7058 | The right injection function on all sets is one to one and onto. (Contributed by BJ and Jim Kingdon, 22-Jun-2022.) |
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Theorem | djulf1o 7059 | The left injection function on all sets is one to one and onto. (Contributed by Jim Kingdon, 22-Jun-2022.) |
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Theorem | djurf1o 7060 | The right injection function on all sets is one to one and onto. (Contributed by Jim Kingdon, 22-Jun-2022.) |
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Theorem | inresflem 7061* | Lemma for inlresf1 7062 and inrresf1 7063. (Contributed by BJ, 4-Jul-2022.) |
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Theorem | inlresf1 7062 | The left injection restricted to the left class of a disjoint union is an injective function from the left class into the disjoint union. (Contributed by AV, 28-Jun-2022.) |
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Theorem | inrresf1 7063 | The right injection restricted to the right class of a disjoint union is an injective function from the right class into the disjoint union. (Contributed by AV, 28-Jun-2022.) |
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Theorem | djuinr 7064 |
The ranges of any left and right injections are disjoint. Remark: the
extra generality offered by the two restrictions makes the theorem more
readily usable (e.g., by djudom 7094 and djufun 7105) while the simpler
statement ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() |
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Theorem | djuin 7065 | The images of any classes under right and left injection produce disjoint sets. (Contributed by Jim Kingdon, 21-Jun-2022.) (Proof shortened by BJ, 9-Jul-2023.) |
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Theorem | inl11 7066 | Left injection is one-to-one. (Contributed by Jim Kingdon, 12-Jul-2023.) |
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Theorem | djuunr 7067 | The disjoint union of two classes is the union of the images of those two classes under right and left injection. (Contributed by Jim Kingdon, 22-Jun-2022.) (Proof shortened by BJ, 6-Jul-2022.) |
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Theorem | djuun 7068 | The disjoint union of two classes is the union of the images of those two classes under right and left injection. (Contributed by Jim Kingdon, 22-Jun-2022.) (Proof shortened by BJ, 9-Jul-2023.) |
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Theorem | eldju 7069* | Element of a disjoint union. (Contributed by BJ and Jim Kingdon, 23-Jun-2022.) |
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Theorem | djur 7070* | A member of a disjoint union can be mapped from one of the classes which produced it. (Contributed by Jim Kingdon, 23-Jun-2022.) Upgrade implication to biconditional and shorten proof. (Revised by BJ, 14-Jul-2023.) |
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Theorem | djuss 7071 | A disjoint union is a subset of a Cartesian product. (Contributed by AV, 25-Jun-2022.) |
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Theorem | eldju1st 7072 |
The first component of an element of a disjoint union is either ![]() ![]() |
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Theorem | eldju2ndl 7073 | The second component of an element of a disjoint union is an element of the left class of the disjoint union if its first component is the empty set. (Contributed by AV, 26-Jun-2022.) |
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Theorem | eldju2ndr 7074 | The second component of an element of a disjoint union is an element of the right class of the disjoint union if its first component is not the empty set. (Contributed by AV, 26-Jun-2022.) |
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Theorem | 1stinl 7075 | The first component of the value of a left injection is the empty set. (Contributed by AV, 27-Jun-2022.) |
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Theorem | 2ndinl 7076 | The second component of the value of a left injection is its argument. (Contributed by AV, 27-Jun-2022.) |
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Theorem | 1stinr 7077 |
The first component of the value of a right injection is ![]() |
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Theorem | 2ndinr 7078 | The second component of the value of a right injection is its argument. (Contributed by AV, 27-Jun-2022.) |
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Theorem | djune 7079 | Left and right injection never produce equal values. (Contributed by Jim Kingdon, 2-Jul-2022.) |
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Theorem | updjudhf 7080* | The mapping of an element of the disjoint union to the value of the corresponding function is a function. (Contributed by AV, 26-Jun-2022.) |
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Theorem | updjudhcoinlf 7081* | The composition of the mapping of an element of the disjoint union to the value of the corresponding function and the left injection equals the first function. (Contributed by AV, 27-Jun-2022.) |
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Theorem | updjudhcoinrg 7082* | The composition of the mapping of an element of the disjoint union to the value of the corresponding function and the right injection equals the second function. (Contributed by AV, 27-Jun-2022.) |
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Theorem | updjud 7083* | Universal property of the disjoint union. (Proposed by BJ, 25-Jun-2022.) (Contributed by AV, 28-Jun-2022.) |
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Syntax | cdjucase 7084 | Syntax for the "case" construction. |
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Definition | df-case 7085 |
The "case" construction: if ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() |
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Theorem | casefun 7086 | The "case" construction of two functions is a function. (Contributed by BJ, 10-Jul-2022.) |
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Theorem | casedm 7087 |
The domain of the "case" construction is the disjoint union of the
domains. TODO (although less important):
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Theorem | caserel 7088 | The "case" construction of two relations is a relation, with bounds on its domain and codomain. Typically, the "case" construction is used when both relations have a common codomain. (Contributed by BJ, 10-Jul-2022.) |
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Theorem | casef 7089 | The "case" construction of two functions is a function on the disjoint union of their domains. (Contributed by BJ, 10-Jul-2022.) |
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Theorem | caseinj 7090 | The "case" construction of two injective relations with disjoint ranges is an injective relation. (Contributed by BJ, 10-Jul-2022.) |
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Theorem | casef1 7091 | The "case" construction of two injective functions with disjoint ranges is an injective function. (Contributed by BJ, 10-Jul-2022.) |
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Theorem | caseinl 7092 | Applying the "case" construction to a left injection. (Contributed by Jim Kingdon, 15-Mar-2023.) |
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Theorem | caseinr 7093 | Applying the "case" construction to a right injection. (Contributed by Jim Kingdon, 12-Jul-2023.) |
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Theorem | djudom 7094 | Dominance law for disjoint union. (Contributed by Jim Kingdon, 25-Jul-2022.) |
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Theorem | omp1eomlem 7095* | Lemma for omp1eom 7096. (Contributed by Jim Kingdon, 11-Jul-2023.) |
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Theorem | omp1eom 7096 |
Adding one to ![]() |
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Theorem | endjusym 7097 | Reversing right and left operands of a disjoint union produces an equinumerous result. (Contributed by Jim Kingdon, 10-Jul-2023.) |
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Theorem | eninl 7098 | Equinumerosity of a set and its image under left injection. (Contributed by Jim Kingdon, 30-Jul-2023.) |
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Theorem | eninr 7099 | Equinumerosity of a set and its image under right injection. (Contributed by Jim Kingdon, 30-Jul-2023.) |
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Theorem | difinfsnlem 7100* |
Lemma for difinfsn 7101. The case where we need to swap ![]() ![]() ![]() ![]() ![]() ![]() |
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