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From Fabian Hueske <fhue...@apache.org>
Subject Re: Scala API rewrite almost complete
Date Thu, 11 Sep 2014 13:32:02 GMT
+1 for removing RelationalQuery
IMO, the Scala examples should mirror the Java examples. So, we should
rather port Java examples to Scala instead of updating existing Scala
examples.

I am also done with the PageRank implementation. Final tests are currently
running and I'll open a PR soon.

I found some things that need to be solved or should at least be mentioned
in the documentation:
- It is crucial to import org.apache.flink.api.scala._. Eclipse shows many
errors regarding type extraction but does not help to solve the problem by
adding this import.
- The method ExecutionEnvironment.generateSequence appears to be missing in
Scala ExecutionEnvironment
- It is not possible to use arrays of Scala primitives such as Int, Long
which are mapped to Java Primitives int, long. Instead you need to force
Java types, e.g., Array[java.lang.Long].
- It is not possible to use Scala List. List is a Trait and considered to
be an Interface which is not supported by the TypeExtractor.

Cheers, Fabian

2014-09-11 15:04 GMT+02:00 Aljoscha Krettek <aljoscha@apache.org>:

> By the way, what was called BatchGradientDescent in the Scala examples
> should be replaced by a port of the LinearRegression Example from
> Java. I had them as two separate examples earlier.
>
> What about RelationalQuery and TPC-H-Q3. Any thoughts about removing
> RelationalQuery?
>
> On Thu, Sep 11, 2014 at 11:43 AM, Aljoscha Krettek <aljoscha@apache.org>
> wrote:
> > I added the Triangle Enumeration Examples, thanks Fabian.
> >
> > So far we have ported: WordCount, KMeans, ConnectedComponents,
> > WebLogAnalysis, TransitiveClosureNaive, TriangleEnumerationNaive/Opt
> >
> > These are the examples people called dibs on:
> >  - PageRank (Fabian)
> >  - BatchGradientDescent (Márton)
> >  - ComputeEdgeDegrees (Hermann)
> >
> > Those are unclaimed (if I'm not mistaken):
> >  - The relational Stuff
> >  - LinearRegression
> >
> > On Wed, Sep 10, 2014 at 6:04 PM, Aljoscha Krettek <aljoscha@apache.org>
> wrote:
> >> Thanks, I added it. I'll keep a running list of ported/unported
> >> examples in my mails. I'll rename the java example package to examples
> >> once the Scala API merge is done.
> >>
> >> I think the termination criterion is fine as it is. Just because Scala
> >> enables functional programming doesn't mean it's always the best
> >> choice. :D
> >>
> >> So far we have ported: WordCount, KMeans, ConnectedComponents,
> >> WebLogAnalysis, TransitiveClosureNaive
> >>
> >> These are the examples people called dibs on:
> >>  - TriangleEnumration and PageRank (Fabian)
> >>  - BatchGradientDescent (Márton)
> >>  - ComputeEdgeDegrees (Hermann)
> >>
> >> Those are unclaimed (if I'm not mistaken):
> >>  - The relational Stuff
> >>  - LinearRegression
> >>
> >> Cheers,
> >> Aljoscha
> >>
> >> On Wed, Sep 10, 2014 at 4:23 PM, Kostas Tzoumas <ktzoumas@apache.org>
> wrote:
> >>> Transitive closure here, I also added a termination criterion in the
> Java
> >>> version:
> https://github.com/ktzoumas/incubator-flink/tree/tc-scala-example
> >>>
> >>> Perhaps you can make the termination criterion in Scala more
> functional?
> >>>
> >>> I noticed that the examples package name is example.java but
> examples.scala
> >>>
> >>> Kostas
> >>>
> >>> On Tue, Sep 9, 2014 at 6:12 PM, Kostas Tzoumas <ktzoumas@apache.org>
> wrote:
> >>>>
> >>>> I'll take TransitiveClosure and PiEstimation (was not on your list).
> >>>>
> >>>> If nobody volunteers for the relational stuff I can take those as
> well.
> >>>>
> >>>> How about removing the "RelationalQuery" from both Scala and Java? It
> >>>> seems to be a proper subset of TPC-H Q3. Does it add some teaching
> value on
> >>>> top of TPC-H Q3?
> >>>>
> >>>> Kostas
> >>>>
> >>>> On Tue, Sep 9, 2014 at 5:57 PM, Aljoscha Krettek <aljoscha@apache.org
> >
> >>>> wrote:
> >>>>>
> >>>>> Thanks, I added it, along with an ITCase.
> >>>>>
> >>>>> So far we have ported: WordCount, KMeans, ConnectedComponents,
> >>>>> WebLogAnalysis
> >>>>>
> >>>>> These are the examples people called dibs on:
> >>>>>  - TriangleEnumration and PageRank (Fabian)
> >>>>>  - BatchGradientDescent (Márton)
> >>>>>  - ComputeEdgeDegrees (Hermann)
> >>>>>
> >>>>> Those are unclaimed (if I'm not mistaken):
> >>>>>  - TransitiveClosure
> >>>>>  - The relational Stuff
> >>>>>  - LinearRegression
> >>>>>
> >>>>> Cheers,
> >>>>> Aljoscha
> >>>>>
> >>>>> On Tue, Sep 9, 2014 at 5:21 PM, Kostas Tzoumas <ktzoumas@apache.org>
> >>>>> wrote:
> >>>>> > WebLog here:
> >>>>> >
> >>>>> >
> https://github.com/ktzoumas/incubator-flink/tree/webloganalysis-example-scala
> >>>>> >
> >>>>> > Do you need any more done?
> >>>>> >
> >>>>> > On Tue, Sep 9, 2014 at 3:08 PM, Aljoscha Krettek <
> aljoscha@apache.org>
> >>>>> > wrote:
> >>>>> >
> >>>>> >> I added the ConnectedComponents Example from Vasia.
> >>>>> >>
> >>>>> >> Keep 'em coming, people. :D
> >>>>> >>
> >>>>> >> On Mon, Sep 8, 2014 at 6:07 PM, Fabian Hueske <fhueske@apache.org
> >
> >>>>> >> wrote:
> >>>>> >> > Alright, will do.
> >>>>> >> > Thanks!
> >>>>> >> >
> >>>>> >> > 2014-09-08 17:48 GMT+02:00 Aljoscha Krettek <
> aljoscha@apache.org>:
> >>>>> >> >
> >>>>> >> >> Ok people, executive decision. :D
> >>>>> >> >>
> >>>>> >> >> Please look at KMeansData.java and KMeans.scala.
I'm storing
> the
> >>>>> >> >> data
> >>>>> >> >> in multi-dimensional object arrays and then converting
it to
> the
> >>>>> >> >> required Java or Scala objects.
> >>>>> >> >>
> >>>>> >> >> Also, I changed isEqualTo to equalTo to make it
consistent
> with the
> >>>>> >> >> Java
> >>>>> >> >> API.
> >>>>> >> >>
> >>>>> >> >> Regarding Join (and coGroup). There is no need
for a keyword,
> you
> >>>>> >> >> can
> >>>>> >> >> just write:
> >>>>> >> >>
> >>>>> >> >> left.join(right).where(0).equalTo(1) { (le, re)
=> new
> MyResult(le,
> >>>>> >> >> re)
> >>>>> >> }
> >>>>> >> >>
> >>>>> >> >> On Mon, Sep 8, 2014 at 2:07 PM, Fabian Hueske
<
> fhueske@apache.org>
> >>>>> >> wrote:
> >>>>> >> >> > Aside from the DataSet issue, I also found
an inconsistency
> with
> >>>>> >> >> > the
> >>>>> >> Java
> >>>>> >> >> > API. In Java join is done as:
> >>>>> >> >> >
> >>>>> >> >> > ds1.join(ds2).where(...).equalTo(...)
> >>>>> >> >> >
> >>>>> >> >> > where in the current Scala this is:
> >>>>> >> >> >
> >>>>> >> >> > ds1.join(d2).where(...).isEqualTo(...)
> >>>>> >> >> >
> >>>>> >> >> > isEqualTo() should be renamed to equalTo(),
IMO.
> >>>>> >> >> > Also, join (+cross and coGroup?) lacks the
with() method
> because
> >>>>> >> "with"
> >>>>> >> >> is
> >>>>> >> >> > a keyword in Scala. Should be offer something
similar for
> Scala
> >>>>> >> >> > or go
> >>>>> >> >> with
> >>>>> >> >> > map() on Tuple2(left, right)?
> >>>>> >> >> >
> >>>>> >> >> > 2014-09-08 13:51 GMT+02:00 Stephan Ewen <sewen@apache.org>:
> >>>>> >> >> >
> >>>>> >> >> >> Instead of Strings, Object[][] would
work as well. That is a
> >>>>> >> >> >> generic
> >>>>> >> >> >> representation of a Tuple.
> >>>>> >> >> >>
> >>>>> >> >> >> Alternatively, they could be stored as
Java or Scala Tuples,
> >>>>> >> >> >> with a
> >>>>> >> >> generic
> >>>>> >> >> >> utility method to convert between the
two.
> >>>>> >> >> >>
> >>>>> >> >> >> On Mon, Sep 8, 2014 at 10:55 AM, Fabian
Hueske
> >>>>> >> >> >> <fhueske@apache.org>
> >>>>> >> >> wrote:
> >>>>> >> >> >>
> >>>>> >> >> >> > Yeah, I ran into the same problem...
> >>>>> >> >> >> >
> >>>>> >> >> >> > +1 for using Strings and parsing
them,  but using the
> >>>>> >> >> >> > CSVFormat
> >>>>> >> won't
> >>>>> >> >> >> work
> >>>>> >> >> >> > because this is based on a FileInputFormat.
> >>>>> >> >> >> > So we would need to parse the Strings
manually...
> >>>>> >> >> >> >
> >>>>> >> >> >> > 2014-09-08 10:35 GMT+02:00 Aljoscha
Krettek
> >>>>> >> >> >> > <aljoscha@apache.org>:
> >>>>> >> >> >> >
> >>>>> >> >> >> > > Hi,
> >>>>> >> >> >> > > on second thought. Maybe we
should just change all the
> >>>>> >> >> >> > > example
> >>>>> >> input
> >>>>> >> >> >> > > data to strings and use CSV
input formats in all the
> >>>>> >> >> >> > > examples.
> >>>>> >> What
> >>>>> >> >> do
> >>>>> >> >> >> > > you think?
> >>>>> >> >> >> > >
> >>>>> >> >> >> > > Cheers,
> >>>>> >> >> >> > > Aljoscha
> >>>>> >> >> >> > >
> >>>>> >> >> >> > > On Mon, Sep 8, 2014 at 7:46
AM, Aljoscha Krettek <
> >>>>> >> >> aljoscha@apache.org>
> >>>>> >> >> >> > > wrote:
> >>>>> >> >> >> > > > Hi,
> >>>>> >> >> >> > > > yes it's unfortunate that
the data types are
> incompatible.
> >>>>> >> >> >> > > > I'm
> >>>>> >> >> afraid
> >>>>> >> >> >> > > > you have to to what you
proposed: move the data to a
> >>>>> >> >> >> > > > static
> >>>>> >> field
> >>>>> >> >> and
> >>>>> >> >> >> > > > convert it in the getDefaultEdgeDataSet()
method in
> Scala.
> >>>>> >> >> >> > > > It's
> >>>>> >> >> not
> >>>>> >> >> >> > > > nice, but copying would
duplicate the data and make it
> >>>>> >> >> >> > > > easier
> >>>>> >> for
> >>>>> >> >> it
> >>>>> >> >> >> > > > to go out of sync in the
Java and Scala versions.
> >>>>> >> >> >> > > >
> >>>>> >> >> >> > > > What do the others think?
This will probably occur in
> all
> >>>>> >> >> >> > > > the
> >>>>> >> >> >> examples.
> >>>>> >> >> >> > > >
> >>>>> >> >> >> > > > Cheers,
> >>>>> >> >> >> > > > Aljoscha
> >>>>> >> >> >> > > >
> >>>>> >> >> >> > > > On Sun, Sep 7, 2014 at
10:04 PM, Vasiliki Kalavri
> >>>>> >> >> >> > > > <vasilikikalavri@gmail.com>
wrote:
> >>>>> >> >> >> > > >> Hey,
> >>>>> >> >> >> > > >>
> >>>>> >> >> >> > > >> I have ported the
Connected Components example, but
> I am
> >>>>> >> >> >> > > >> not
> >>>>> >> sure
> >>>>> >> >> >> how
> >>>>> >> >> >> > to
> >>>>> >> >> >> > > >> reuse the example
input data from java-examples.
> >>>>> >> >> >> > > >> In the ConnectedComponentsData
class, the vertices
> and
> >>>>> >> >> >> > > >> edges
> >>>>> >> data
> >>>>> >> >> >> are
> >>>>> >> >> >> > > >> produced by the methods
getDefaultVertexDataSet()
> >>>>> >> >> >> > > >> and getDefaultEdgeDataSet(),
which take
> >>>>> >> >> >> > > >> an org.apache.flink.api.java.ExecutionEnvironment
as
> >>>>> >> parameter.
> >>>>> >> >> >> > > >>
> >>>>> >> >> >> > > >> One way is to provide
public static fields (like in
> the
> >>>>> >> >> >> WordCountData
> >>>>> >> >> >> > > >> class), but this introduces
a conversion
> >>>>> >> >> >> > > >> from org.apache.flink.api.java.tuple.Tuple2
to Scala
> >>>>> >> >> >> > > >> tuple and
> >>>>> >> >> from
> >>>>> >> >> >> > > >> java.lang.Long to
scala.Long and I guess this is an
> >>>>> >> unnecessary
> >>>>> >> >> >> > > complexity
> >>>>> >> >> >> > > >> for an example (?).
> >>>>> >> >> >> > > >> Another way is, of
course, to copy the example data
> in
> >>>>> >> >> >> > > >> the
> >>>>> >> Scala
> >>>>> >> >> >> > > example.
> >>>>> >> >> >> > > >>
> >>>>> >> >> >> > > >> Am I missing something
here?
> >>>>> >> >> >> > > >>
> >>>>> >> >> >> > > >> Thanks!
> >>>>> >> >> >> > > >>
> >>>>> >> >> >> > > >> Cheers,
> >>>>> >> >> >> > > >> V.
> >>>>> >> >> >> > > >>
> >>>>> >> >> >> > > >>
> >>>>> >> >> >> > > >> On 5 September 2014
15:52, Aljoscha Krettek <
> >>>>> >> aljoscha@apache.org
> >>>>> >> >> >
> >>>>> >> >> >> > > wrote:
> >>>>> >> >> >> > > >>
> >>>>> >> >> >> > > >>> Alright, I updated
my repo:
> >>>>> >> >> >> > > >>>
> >>>>> >> >>
> https://github.com/aljoscha/incubator-flink/commits/scala-rework
> >>>>> >> >> >> > > >>>
> >>>>> >> >> >> > > >>> This now has a
working WordCount example. It's
> pretty
> >>>>> >> >> >> > > >>> much a
> >>>>> >> >> copy
> >>>>> >> >> >> of
> >>>>> >> >> >> > > >>> the Java example
with some fixups for the syntax and
> >>>>> >> >> >> > > >>> lambda
> >>>>> >> >> >> > functions.
> >>>>> >> >> >> > > >>> You'll also notice
that I added the java-examples
> as a
> >>>>> >> >> dependency
> >>>>> >> >> >> for
> >>>>> >> >> >> > > >>> the scala-examples.
I did this to reuse the example
> >>>>> >> >> >> > > >>> input
> >>>>> >> data.
> >>>>> >> >> >> > > >>>
> >>>>> >> >> >> > > >>> When you ported
a program you can do a pull request
> >>>>> >> >> >> > > >>> against
> >>>>> >> my
> >>>>> >> >> repo
> >>>>> >> >> >> > > >>> and I will collect
the examples.
> >>>>> >> >> >> > > >>>
> >>>>> >> >> >> > > >>> Happy coding.
:D
> >>>>> >> >> >> > > >>>
> >>>>> >> >> >> > > >>> On Fri, Sep 5,
2014 at 12:19 PM, Hermann Gábor <
> >>>>> >> >> >> reckoner42@gmail.com
> >>>>> >> >> >> > >
> >>>>> >> >> >> > > >>> wrote:
> >>>>> >> >> >> > > >>> > +1
> >>>>> >> >> >> > > >>> >
> >>>>> >> >> >> > > >>> > ComputeEdgeDegrees
for me!
> >>>>> >> >> >> > > >>> >
> >>>>> >> >> >> > > >>> >
> >>>>> >> >> >> > > >>> > On Fri, Sep
5, 2014 at 11:44 AM, Márton Balassi <
> >>>>> >> >> >> > > >>> balassi.marton@gmail.com>
> >>>>> >> >> >> > > >>> > wrote:
> >>>>> >> >> >> > > >>> >
> >>>>> >> >> >> > > >>> >> +1
> >>>>> >> >> >> > > >>> >>
> >>>>> >> >> >> > > >>> >> BatchGradientDescent
for me :)
> >>>>> >> >> >> > > >>> >>
> >>>>> >> >> >> > > >>> >>
> >>>>> >> >> >> > > >>> >> On Fri,
Sep 5, 2014 at 11:15 AM, Kostas Tzoumas <
> >>>>> >> >> >> > > ktzoumas@apache.org>
> >>>>> >> >> >> > > >>> >> wrote:
> >>>>> >> >> >> > > >>> >>
> >>>>> >> >> >> > > >>> >> >
+1
> >>>>> >> >> >> > > >>> >> >
> >>>>> >> >> >> > > >>> >> >
I go for WebLogAnalysis.
> >>>>> >> >> >> > > >>> >> >
> >>>>> >> >> >> > > >>> >> >
My experience with Scala consists of going
> through
> >>>>> >> >> >> > > >>> >> >
a
> >>>>> >> >> tutorial
> >>>>> >> >> >> so
> >>>>> >> >> >> > > this
> >>>>> >> >> >> > > >>> >> will
> >>>>> >> >> >> > > >>> >> >
be a good stress test both for me and the new
> API
> >>>>> >> >> >> > > >>> >> >
:-)
> >>>>> >> >> >> > > >>> >> >
> >>>>> >> >> >> > > >>> >> >
> >>>>> >> >> >> > > >>> >> >
On Thu, Sep 4, 2014 at 9:09 PM, Vasiliki
> Kalavri <
> >>>>> >> >> >> > > >>> >> >
vasilikikalavri@gmail.com>
> >>>>> >> >> >> > > >>> >> >
wrote:
> >>>>> >> >> >> > > >>> >> >
> >>>>> >> >> >> > > >>> >> >
> +1 for having other people implement the
> >>>>> >> >> >> > > >>> >> >
> examples!
> >>>>> >> >> >> > > >>> >> >
> Connected Components and Kmeans for me :)
> >>>>> >> >> >> > > >>> >> >
>
> >>>>> >> >> >> > > >>> >> >
> -V.
> >>>>> >> >> >> > > >>> >> >
>
> >>>>> >> >> >> > > >>> >> >
>
> >>>>> >> >> >> > > >>> >> >
> On 4 September 2014 21:03, Fabian Hueske <
> >>>>> >> >> >> fhueske@apache.org>
> >>>>> >> >> >> > > >>> wrote:
> >>>>> >> >> >> > > >>> >> >
>
> >>>>> >> >> >> > > >>> >> >
> > I go for TriangleEnumeration and PageRank.
> >>>>> >> >> >> > > >>> >> >
> >
> >>>>> >> >> >> > > >>> >> >
> > Let's also do the examples similar to the
> Java
> >>>>> >> >> examples:
> >>>>> >> >> >> > > >>> >> >
> > - running out-of-the-box without parameters
> >>>>> >> >> >> > > >>> >> >
> > - parameters for external data
> >>>>> >> >> >> > > >>> >> >
> > - follow a similar code structure
> >>>>> >> >> >> > > >>> >> >
> >
> >>>>> >> >> >> > > >>> >> >
> >
> >>>>> >> >> >> > > >>> >> >
> >
> >>>>> >> >> >> > > >>> >> >
> > 2014-09-04 20:56 GMT+02:00 Aljoscha
> Krettek <
> >>>>> >> >> >> > > aljoscha@apache.org
> >>>>> >> >> >> > > >>> >:
> >>>>> >> >> >> > > >>> >> >
> >
> >>>>> >> >> >> > > >>> >> >
> > > Will do, then people can reserve their
> >>>>> >> >> >> > > >>> >> >
> > > favourite
> >>>>> >> >> >> examples
> >>>>> >> >> >> > > here.
> >>>>> >> >> >> > > >>> >> >
> > >
> >>>>> >> >> >> > > >>> >> >
> > > On Thu, Sep 4, 2014 at 8:55 PM, Fabian
> Hueske
> >>>>> >> >> >> > > >>> >> >
> > > <
> >>>>> >> >> >> > > >>> fhueske@apache.org>
> >>>>> >> >> >> > > >>> >> >
> > wrote:
> >>>>> >> >> >> > > >>> >> >
> > > > Hi,
> >>>>> >> >> >> > > >>> >> >
> > > >
> >>>>> >> >> >> > > >>> >> >
> > > > I think having examples implemented by
> >>>>> >> >> >> > > >>> >> >
> > > > different
> >>>>> >> >> >> people
> >>>>> >> >> >> > > >>> proved to
> >>>>> >> >> >> > > >>> >> >
be
> >>>>> >> >> >> > > >>> >> >
> > > > valuable in the past.
> >>>>> >> >> >> > > >>> >> >
> > > > I'd help with two or three examples.
> >>>>> >> >> >> > > >>> >> >
> > > >
> >>>>> >> >> >> > > >>> >> >
> > > > It might be helpful if you'd port a
> simple
> >>>>> >> >> >> > > >>> >> >
> > > > first
> >>>>> >> >> one
> >>>>> >> >> >> > such
> >>>>> >> >> >> > > as
> >>>>> >> >> >> > > >>> >> >
> WordCount.
> >>>>> >> >> >> > > >>> >> >
> > > >
> >>>>> >> >> >> > > >>> >> >
> > > > Fabian
> >>>>> >> >> >> > > >>> >> >
> > > >
> >>>>> >> >> >> > > >>> >> >
> > > >
> >>>>> >> >> >> > > >>> >> >
> > > > 2014-09-04 18:47 GMT+02:00 Aljoscha
> Krettek
> >>>>> >> >> >> > > >>> >> >
> > > > <
> >>>>> >> >> >> > > >>> aljoscha@apache.org
> >>>>> >> >> >> > > >>> >> >:
> >>>>> >> >> >> > > >>> >> >
> > > >
> >>>>> >> >> >> > > >>> >> >
> > > >> Hi,
> >>>>> >> >> >> > > >>> >> >
> > > >> I have a working rewrite of the Scala
> API
> >>>>> >> >> >> > > >>> >> >
> > > >> here:
> >>>>> >> >> >> > > >>> >> >
> > > >>
> >>>>> >> >> >> > > >>> >>
> >>>>> >> >> >>
> https://github.com/aljoscha/incubator-flink/commits/scala-rework
> >>>>> >> >> >> > > >>> >> >
> > > >>
> >>>>> >> >> >> > > >>> >> >
> > > >> I'm hoping that I'll only have to
> write
> >>>>> >> >> >> > > >>> >> >
> > > >> the
> >>>>> >> tests
> >>>>> >> >> and
> >>>>> >> >> >> > > port
> >>>>> >> >> >> > > >>> the
> >>>>> >> >> >> > > >>> >> >
> > > >> examples. Do you think it makes sense
> to
> >>>>> >> >> >> > > >>> >> >
> > > >> let
> >>>>> >> other
> >>>>> >> >> >> > people
> >>>>> >> >> >> > > >>> port
> >>>>> >> >> >> > > >>> >> the
> >>>>> >> >> >> > > >>> >> >
> > > >> examples, so that someone else uses
> it and
> >>>>> >> maybe
> >>>>> >> >> >> > notices
> >>>>> >> >> >> > > some
> >>>>> >> >> >> > > >>> >> >
quirks
> >>>>> >> >> >> > > >>> >> >
> > > >> in the API?
> >>>>> >> >> >> > > >>> >> >
> > > >>
> >>>>> >> >> >> > > >>> >> >
> > > >> Cheers,
> >>>>> >> >> >> > > >>> >> >
> > > >> Aljoscha
> >>>>> >> >> >> > > >>> >> >
> > > >>
> >>>>> >> >> >> > > >>> >> >
> > >
> >>>>> >> >> >> > > >>> >> >
> >
> >>>>> >> >> >> > > >>> >> >
>
> >>>>> >> >> >> > > >>> >> >
> >>>>> >> >> >> > > >>> >>
> >>>>> >> >> >> > > >>>
> >>>>> >> >> >> > >
> >>>>> >> >> >> >
> >>>>> >> >> >>
> >>>>> >> >>
> >>>>> >>
> >>>>
> >>>>
> >>>
>

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