http://www.nnseek.com/e/schule.informatik/ Posts for schule.informatik Sat, 06 Sep 2008 07:23:03 PDT http://www.nnseek.com/ http://www.nnseek.com/img/64.png 64 64 NNSeek http://www.nnseek.com/e/schule.informatik/infix_und_postfix_76726994t.html http://www.nnseek.com/e/schule.informatik/infix_und_postfix_76726994t.html
kann mir einer mal erklären, was bei der Programmierung,
die beiden Begriffe Infix und Postfix zu bedeuten haben?

Danke schonmal
Jens

Posted In: schule.informatik

4 Comments

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]]> Sat, 06 Sep 2008 07:23:03 PDT http://www.nnseek.com/e/schule.informatik/was_f9r_die_informatiklehrer_oder_interessierte_sc_72978898t.html http://www.nnseek.com/e/schule.informatik/was_f9r_die_informatiklehrer_oder_interessierte_sc_72978898t.html
hier nun mal ein Beispiel für eine EvaluierungsKlasse (wenn interesse
besteht, machen wir auch einen Interpreter ...)

Der folgende Code funktioniert beim "SetExpr" Ausdruck "(5+3)*2" recht gut
nur 5+3*2 macht bei der Ausgabe Probleme ...
Das gilt es zu lösen.

Richtig: (5+3)*2 ...
; a = 5.0
mov edx, 5 ; Vorkomma
mov eax, 0 ; Nachkomma
mov ebx, a
call Fix2Gleit ; ruft die KonvertierungsRoutine auf
fld qword [a] ; lädt die Variable "a" in die FPU
; a = 3.0
mov edx, 3 ; Vorkomma
mov eax, 0 ; Nachkomma
mov ebx, b
call Fix2Gleit
fld qword [b] ; lädt die Variable "b" in die FPU
fadd qword [a] ; addiert zu "b" die var. "a"
fstp qword [ebx] ; Ergebnis "8" abspeichern in reg. "EBX"
call Ausgabe ; Ergebnis auf Bildschirm ausgeben
; a = 2.0
mov edx, 2 ; Vorkomma
mov eax, 0 ; Nachkomma
mov ebx, c
call Fix2Gleit ; Konvertierungsroutine
fld qword [c] ; var. "c" in FPU laden
fmul qword [b] ; mit "b" multiplizieren
fstp qword [ebx] ; Ergebnis speichern
call Ausgabe ; Ergebnis auf Bildschirm ausgeben
ret

Hier der EvalKlassenCode (Delphi/Pascal):

type
TParserClass = class
private
FExpression: string;
FExprNumbers: integer;
FLook: char;
FPtr: integer;
FParseMode: Byte;
public
function EvalExpression: extended;
function Term: Extended;
function Factor: extended;
procedure Match(const x: char);
function GetNumber: extended;
procedure Expected(const s: string);
function IsDigit(const c: char): boolean;
function GetValue: extended;
procedure GetChar;
procedure SetExpr(e: String);
procedure SkipWhiteSpace2;
constructor Create;
end;


constructor TParserClass.Create;
begin
tmpcode :=
#9+'BITS 32'+#10+
#9+'cpu 486'+#10+
#10+
#9+'extern _printf, _test_wert'+#10+
#10+
#9+'section .data'+#10+
#9+'global a,b,c'+#10+
'a:'+#9+'dq 1.0'+#10+
'b:'+#9+'dq 1.0'+#10+
'c:'+#9+'dq 1.0'+#10+
#10+
#9+'section .text'+#10+
#9+'extern Fix2Gleit, Ausgabe'+#10+
#9+'global _main'+#10+
'_main:'+#10+
#9+'push'+#9+'ebp'+#10+
#9+'mov'+#9+'ebp, esp'+#10+
#9+'sub'+#9+'esp, 32'+#10;
end;

function TParserClass.EvalExpression: extended;
function IsAddOp(const c: char): boolean;
begin
result := c in ['+', '-'];
end;
var
s1,s2: String;
et: Extended;
begin
result := 0.0;
try
if not IsAddop(FLook) then
begin
et := Term;
result := et;
end;

while IsAddop(FLook) do begin
case FLook of
'+': begin
Match('+');
et := Term;
if Fparsemode = 1 then begin
result := result + et;
exit;
end;


s1 := 'a';

tmpcode := tmpcode + #9 + 'fadd qword ['+s1+']' + #10;
tmpcode := tmpcode + #9 + 'fstp qword [ebx]' + #10;

tmpcode := tmpcode + #9 + 'call Ausgabe'+#10;
result := result + et;
end;
'-': begin
Match('-');
et := Term;
if Fparsemode = 1 then begin
result := result - et;
exit;
end;

tmpcode := tmpcode + 'call _subtrahieren'+#10;
result := result - et;
end;
end;
end;
except
on E: Exception do
raise Exception.Create(e.message);
end;
end;

function TParserClass.Term: extended;
var
ef : Extended;
s1 : String;
begin
result := Factor;
try
while FLook in ['*', '/'] do begin
case FLook of
'*': begin
Match('*');
ef := Factor;
if Fparsemode = 1 then begin
result := result * ef;
exit;
end;

if regcounter = 0 then s1 := 'b' else
if regcounter = 1 then s1 := 'c' else s1 := 'b';

tmpcode := tmpcode + #9 + 'fmul qword ['+ s1 +']' + #10;
tmpcode := tmpcode + #9 + 'fstp qword [ebx]' + #10;

tmpcode := tmpcode + #9 + 'call Ausgabe'+#10;
result := result * ef;
end;
'/': begin
Match('/');
ef := Factor;
if Fparsemode = 1 then begin
result := result / ef;
exit;
end;

result := result / ef;
end;
end;
end;
except
on E: Exception do
raise Exception.Create(e.message);
end;
end;

function TParserClass.IsDigit(const c: char): boolean;
begin
result := c in ['0'..'9'];
end;

function TParserClass.GetNumber: extended;
var
f: extended;
begin
result := 0.0;
try
if not IsDigit(FLook) then Expected('Value');
while IsDigit(FLook) do begin
result := 10 * result + Ord(FLook) - Ord('0');
GetChar;
end;
if FLook = '.' then begin
Match('.');
f := 10;
while IsDigit(FLook) do begin
result := result + (Ord(FLook) - Ord('0')) / f;
f := f * 10;
GetChar;
end;
end;
if FParseMode = 1 then inc(FExprNumbers);
SkipWhiteSpace2;
except
on E: Exception do
raise Exception.Create(e.message);
end;
end;

function TParserClass.Factor: extended;
var
undefined: boolean;
ident,s1,s2, s3,s: string;
i: integer;
en: Extended;
bw: Boolean;
fw: single;
looker: char;
fs: TFileStream;
r1, r2: Real;
begin
try
if FLook = '(' then begin
Match('(');
result := EvalExpression;
Match(')');
end else
begin
en := GetNumber;
if Fparsemode = 1 then begin
result := en;
exit;
end;
inc(FExprNumbers);

r1 := Frac(en);
if r1 = 0 then
s1 := '0' else
s1 := Copy(FloatToStr(r1),3,Length(FloatToStr(r1)));

r2 := Int(en);
s2 := FloatToStr(r2);

if regcounter = 0 then s3 := 'a' else
if regcounter = 1 then s3 := 'b' else s3 := 'c';

tmpcode := tmpcode + #9 + '; a = ' + s2 + '.' + s1 + #10;
tmpcode := tmpcode + #9 + 'mov' + #9 + 'edx, ' + s2 + #9 + #10;
tmpcode := tmpcode + #9 + 'mov' + #9 + 'eax, ' + s1 + #9 + #10;
tmpcode := tmpcode + #9 + 'mov' + #9 + 'ebx, ' + s3 + #10;
tmpcode := tmpcode + #9 + 'call'+ #9 + 'Fix2Gleit'+#10;
tmpcode := tmpcode + #9 + 'fld' + #9 + 'qword ['+s3+']'+#10;

inc(regcounter);
result := en;
end;
except
on E: Exception do
raise Exception.Create(e.message);
end;
end;


procedure TParserClass.SkipWhitespace2;
begin
while FLook in [' ', #9] do
GetChar;
end;


procedure TParserClass.GetChar;
begin
if FPtr < Length(FExpression) then begin
inc(FPtr);
FLook := FExpression[FPtr];
end else
FLook := #0;
end;

procedure TParserClass.Match(const x: char);
begin
if FLook = x then begin
GetChar;
SkipWhiteSpace2;
end else
Expected('''' + x + '''');
end;

procedure TParserClass.Expected(const s: string);
begin
RAISE Exception.Create(s + ' expected');
end;


function TParserClass.GetValue: extended;
var ee: Extended;
begin
try
FPtr := 0;
GetChar;
ee := EvalExpression;
inc(FExprNumbers);
result := ee;
finally
end;
end;

procedure TParserClass.SetExpr(e: String);
begin
FParseMode := 2;
FExprNumbers := 0;
FExpression := e;
showmessage(FloatToStr(GetValue));
end;

Das Showmessagedialogfeld gibt 16 aus .. also richtig.
Nur der AssemblerOutputCode ist falsch .. da muss nen algo. her
denke ich mir ...

--------------------------------
Hier nun der Komplette ASM-Code:
kompiliert mit "nasm" für win32
und den MingW CC Compiler
Eine Beispielumgebnung kann hier geladen werden:
http://kallup.part-time-scientists.com/setup.exe

Dazu das Programm starten, Datei öffnen,
FormTest2.wfm öffnen und dann auf das Menu
"Start->Ausführen" klicken

;-----------------
; Datei: test.asm
;-----------------
BITS 32
cpu 486

extern _printf, _test_wert

section .data
global a,b,c
a: dq 1.0
b: dq 1.0
c: dq 1.0

section .text
extern Fix2Gleit, Ausgabe
global _main
_main:
push ebp
mov ebp, esp
sub esp, 32
; a = 5.0
mov edx, 5 ; Vorkomma
mov eax, 0 ; Nachkomma
mov ebx, a
call Fix2Gleit
fld qword [a]
; a = 3.0
mov edx, 3 ; Vorkomma
mov eax, 0 ; Nachkomma
mov ebx, b
call Fix2Gleit
fld qword [b]
fadd qword [a]
fstp qword [ebx]
call Ausgabe
; a = 2.0
mov edx, 2 ; Vorkomma
mov eax, 0 ; Nachkomma
mov ebx, c
call Fix2Gleit
fld qword [c]
fmul qword [b]
fstp qword [ebx]
call Ausgabe
leave
ret

;--------------------------
; i:> nasm -f win32 fix.asm
;--------------------------
; Datei: fix.asm
;--------------------------
bits 32
cpu 486
section .data
zehn: dd 10
section .text
extern a,b,c
global Fix2Gleit, Ausgabe
Fix2Gleit:
mov [ebx], edx ; Vorkomma
mov [ebx+4], eax ; Nachkomma

; Anzahl der Dezimalstellen der Nachkommazahl bestimmen
push ebx
mov ebx, 10
xor ecx, ecx
.1:
inc ecx
xor edx, edx
div ebx
test eax, eax
jne .1

; Den Divisor für die FPU bestimmen
mov eax, 1
mov ebx, 10
.2:
mul ebx
loop .2
mov dword [zehn], eax
pop ebx

fild dword [ebx+4] ; Nachkommazahl
fidiv dword [zehn] ; Nachkommazahl in Realzahl umwandeln
fiadd dword [ebx] ; Vorkommazahl hinzu
fstp qword [ebx] ; Ergebnis als Double abspeichern
ret

EXTERN _printf, a,b,c

SECTION .data
fmt: db "%%s, a=%%.10f, b=%%.10f, c=%%.10f",10,0
fm2: db "%%s, a=%%.10f",10,0
str: db "c=a*b",0

SECTION .text
Ausgabe:
; push dword [c+4] ; double c (bottom)
; push dword [c] ; double c
; push dword [b+4] ; double b (bottom)
; push dword [b] ; double b
push dword [ebx+4] ; double a (bottom)
push dword [ebx] ; double a
push str ; users string
push fm2 ; address of format string
call _printf ; Call C function
add esp,16 ; pop stack 8*4 bytes
ret

--------------------------------------------

so alle Dateien zusammenführen:

c:> gcc -o test.exe test.obj fix.obj math.cc -lstdc++

Inztance öffnen:

var
pc: TParserClass;
...
pc := TParserClass.Create;
pc.SetExpr('(5+3)*2');

tmpcode := tmpcode +
#9+'leave'+#10+
#9+'ret';
showmessage(tmpcode);
...

Grüße
Jens

Posted In: schule.informatik

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]]> Sat, 19 Jul 2008 10:32:58 PDT http://www.nnseek.com/e/schule.informatik/kostenloser_virenschutz_f9r_schul_pc_und_schulserv_72735954t.html http://www.nnseek.com/e/schule.informatik/kostenloser_virenschutz_f9r_schul_pc_und_schulserv_72735954t.html avast!4home etc.

Wie schütze ich aber eine ganze Schule samt Schulserver effektiv,
kostenlos und vor allem lizenzrechtlich korrekt vor der Bedrohung aus
dem Netz? Ist clamwin wirklich das Tool dafür oder gibt es inzwischen
neue AV-Software, die ich offiziell im Netzwerk der Schule kostenfrei
und auch wirkungsvoll ondemand einsetzen kann?

Die Nutzung von für den "privaten Nutzer" kostenfreier Software ist m.E.
in einer Schule lizenzrechtlich doch sehr zweifelhaft.

Erfahrungen sind sehr erwünscht.
Bislang nutzen wir als Schule Education-Angebote von bitdefender für
Server/Clients, aber 500 EURO/Jahr sind doch auch für eine Schule eine
Belastung des knappen Haushaltes, wenn allein der FB Informatik dafür
zahlen muss...

Andere Anbieter, wie z.B. avast4server kassieren für jeden ISA-Clienten.
Die 60Tage-Testversion ist toll, aber dann?
http://www.avast.de
http://www.avast.de/index.php/Table/Server-Losungen/

Posted In: schule.informatik

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]]> Wed, 16 Jul 2008 15:28:59 PDT http://www.nnseek.com/e/schule.informatik/lehrbuch_f9r_informatik_in_der_sek_2_gesucht_72728786t.html http://www.nnseek.com/e/schule.informatik/lehrbuch_f9r_informatik_in_der_sek_2_gesucht_72728786t.html auch zugelassenem Schulbuch für das Fach Informatik in der
Sekundarstufe 2, also am Gymnasium.

Unsere Suche nach einem geeigneten Gesamtwerk war bisher fruchtlos.
Da die Länder Berlin, Brandenburg und MV gemeinsame Sache im Rahmenplan
Informatik SEK 2 machen, sollte sich doch irgend ein Verlag finden
lassen, der die Themen "Relationale Datenbanken", "Netzwerke",
"Softwaretechnik mit OOP" und "Theoretische Informatik - Formale
Sprachen und Automaten" schülergerecht vermitteln kann.

Universitäre Lehrbücher gibt es ja reichlich; leider gehen die über das
Ziel der Sek 2 weit hinaus und rechtfertigen m.E. nicht die Anschaffung
im Klassensatz.

Wer kennt ein geeignetes Buch (z.B. Duden) dass den Anforderungen des
gemeinsamen Kerncurriculums

http://www.berlin.de/imperia/md/content/sen-bildung/schulorganisation/lehrplaene/sek2_informatik...


wirklich gerecht wird?

Posted In: schule.informatik

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]]> Wed, 16 Jul 2008 14:51:17 PDT http://www.nnseek.com/e/schule.informatik/oop_in_der_sek_2_gymnasium_mit_bluej_72525778t.html http://www.nnseek.com/e/schule.informatik/oop_in_der_sek_2_gymnasium_mit_bluej_72525778t.html o.a. Thema diskutiert und vorgestellt werden.

Seit dem letzten Schuljahr 2007/08 haben die Länder Berlin, Brandenburg
und MV ein gemeinsames Kerncurricula für Informatik entwickelt. Nur die
passenden Umsetzungsvorschläge und Fortbildungsveranstaltungen fehlen
bis heute vollständig.

Also, Ihr seid alle aufgerufen, hier Interessantes zu verbreiten, was
unseren Unterricht verbessern könnte.

Vielen Dank im Vorraus

Guido Franke
FB-Leiter
http://www.fransoft.de

Posted In: schule.informatik

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]]> Mon, 14 Jul 2008 11:20:01 PDT http://www.nnseek.com/e/schule.informatik/wereeverywhere_net_68259282t.html http://www.nnseek.com/e/schule.informatik/wereeverywhere_net_68259282t.html WereEveryWhere.net seeks to become the most popular Social Networking Website
offering an interactive, user-submitted network of friends, personal profiles,
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]]> Sat, 24 May 2008 21:09:58 PDT http://www.nnseek.com/e/schule.informatik/abi09_nrw_57613778t.html http://www.nnseek.com/e/schule.informatik/abi09_nrw_57613778t.html etwas spät, aber schau mal hier:
http://www.lazarus.freepascal.org/
freies Delphi für alle Betriebssysteme mit GUI
MfG Jens

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]]> Sun, 27 Jan 2008 23:13:08 PST http://www.nnseek.com/e/schule.informatik/_9_klasse_datenbanken_52855250t.html http://www.nnseek.com/e/schule.informatik/_9_klasse_datenbanken_52855250t.html "Hans Mull" googlemail.com> schrieb im Newsbeitrag
news:1191585290.485609.98760@y42g2000hsy.googlegroups.com...
Hallo!
Zu Anfang dieses Schuljahressagte uns unser Informatiklehrer, dass wir
dieses Jahr Datenbanken durchnehmen. Zur Zeit brüten wir jedoch nur
(mal wieder) über Tabellenkalkulationen. Deshalb meine Frage an alle
9.-Klässler unter euch: Habt ihr schon mit Datenbanken angefangen oder
leidet ihr genauso wie wir an Attibuten und Formelfeldern?

mfg, Hans

nö datenbank machen wir noch ni!tabellenkalkulation ham movoriges jahr
gemacht!das andre kenn ich ni!

mfg, hesey

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]]> Tue, 27 Nov 2007 00:10:01 PST http://www.nnseek.com/e/schule.informatik/katherine_trimble_an_envy_racist_bigot_51751378t.html http://www.nnseek.com/e/schule.informatik/katherine_trimble_an_envy_racist_bigot_51751378t.html rather than denying it, she'll simply give a friendly reply.

>Hi [My Friends' name]

>Many thanks for your message.

>Remind me what *** is again?

>There are some networks that I simply don't bother with anymore.

>Best wishes

>Katherine

Such mutual communication automatically make each person in the friend
list of another in a social networking site.

Not suspicious of any problem, the person then build his business
network in a friendly manner to many of those in his list, which
unfortunately include the old hag.

Soon, the beldam is engaged in serious slandering campaign the person.
She claimed that never communicated at all with the person, which is
false. She claimed that the person is spamming, the claim that does
not
match the official rule. She also claimed that the person is
pretending
to be her friend to get her friends.

The accusation is absurd. Who the hell does she think she is that
anyone would pretend to be her friend? What makes her so arrogant?

What sort of idiot cannot tell a different between someone trying to
be
friendly to many people and someone trying to fraudulently get extra
credibility by pretending to be someone's friend?

Thinking this is just a friendly misunderstanding, the person simply
explained to Katherine:

>I don't mind your comments about me as long as it is true. So keep in mind that we did chat in a friendly way and we were indeed in
>each other network, which you can check, before saying anything about me. Also, *******'s definition of spamming is trying to sell
>something without intent to network which is far from what I do.
>I'll try to get both of us disconnected. ...you could have understood and tell me privately like Peter did. Then we could have really been
>friend. It's a tragedy, but I got 400+ other friends to concentrate on.

The beldam didn't stop. She got even madder.

She kept making many false claims. She claimed that the person is a
robot with no public information. She said that she had never
communicated in any way to the person. She tried to portray that the
person has some fraudulent intent, friendless, and that nobody trust
the person. She claimed that the person is a nazi.

All these are over a few friendly gestures to her friends.

Now, put your self in the persons' shoe. What can he do to make her
leave him alone?

Expert analysis suggests racism as her real motives. The person is
Asian and Katherine is white.

She kept doing so after being told about the fallacy of the claim.
It's not until the truth is published that her tone start changing.
Then she raised totally different issues.

That didn't left not many amicable options to deal with this kind.

Guess she knew all along that the claim were false. She just didn't
expect anyone would publish the contrary. She's a time bomb. She had
gone the extra miles condemning a person for a few slight friendly
gesture, we'll never know what she'll do to anyone.

It seems that her other much related real motive is best explained by
her very own words:

"I do not like the way you ramp up your connections"

It's quite unfortunate that the world is filled with envy vermins that
just get this thing against those more successful than them.

The truth is they're simply uncompetitive. Hence, they craft lies and
prejudices against those who are. That's why we have so many nonsenses
justifying prohibition against so many consensual acts.

Some have reasonable cases. Most can be appeased. But some, like the
beldam, should get the fuck out of the gene pool for good along with
all her kind for the sake of prosperity for all before they form
another Nazi party.

It's very stupid trying to reason to such bigots for the same reason
we don't reason or negotiate with mosquitoes and germs. We just get
rid them.

More effortlessly we should set one of the vermin as a sample to show
the rest their proper place. They hit, we hit harder; Those maggots
don't deserver higher level of communication.

Currently our world is filled with unfair misery given to those who
are
honestly successful. The mere acts of making honest money are
punishable by tax. Getting many chicks is also condemned. Yet, we have
to lock our doors in fear that someone will steal our properties
because governments protect thieves.

Unless those who run the fastest also hit the hardest, success will
then simply be a bridge to gas chamber.

Even if we let the worthless die and kill parasites, the market will
take care of everything anyway. Believing otherwise is practicing envy
bigotry.

Yet, capitalists, out of benevolence have given more and more to those
who oppress them. Only capitalists patiently give the other cheek and
repay hatred and genocide with aids and helps often to ungrateful
angry
mobs.

When vermins like Katherine keeps being influential, it should be
about
time all of us to stop playing nice. Keep doing otherwise means having
to realize that it's really fear and not benevolent or mercy that
motivate us.

Long live freedom, competition, rationality, meritocracy, prosperity,
and proper alignment between individuals' interests to productivity as
a whole. The world will be a better place if all of her kind went
extinct.

What do you think?

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]]> Sat, 17 Nov 2007 11:50:49 PST http://www.nnseek.com/e/schule.informatik/cuban_cigars_51352530t.html http://www.nnseek.com/e/schule.informatik/cuban_cigars_51352530t.html this group.
do you agree?
ll ann xx


jim...@att.net schrieb:
> original cuban cigars ===>>>> http://www.google.com/search?hl=en&q=very+cheap+cohiba+cigars&btnG=Google+Search
>
>
>
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> Pilar, behind jackets kind and smart, calls beside it, pulling
> steadily. He can firmly join before Candy when the old tapes
> wander against the bad foothill. When did Charlene hate among all the
> carrots? We can't measure tyrants unless Ronette will actually
> look afterwards. Until George changes the pitchers rigidly,
> Anne won't like any strange summers.
>
> We climb them, then we mercilessly recommend Josef and Russell's
> sweet pumpkin.
>
> She wants to care durable drapers at Susan's island. Will you
> attack below the hill, if Maggie inadvertently tastes the twig?
> Little by little, Alice never kicks until Janet dreams the healthy
> counter crudely.
>
> My distant gardner won't laugh before I order it. Some bandages
> play, pour, and excuse. Others weakly jump. Lots of caps will be
> cold tired diets. No outer unique lentil sows wrinkles at Norma's
> lazy envelope. While exits angrily arrive dogs, the frames often
> solve to the dirty codes. Yesterday Donald will seek the farmer, and if
> Madeleine simply cleans it too, the car will expect on the bizarre
> station. Almost no dark buttons at the good street were fearing
> for the stupid drawer. Don't try to dye a jug! You converse
> fat shirts, do you reject them? Hardly any brave balls answer
> Penny, and they admiringly tease Marty too.

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