1: # The LearningOnline Network with CAPA
2: # mutliple choice style responses
3: #
4: # $Id: radiobuttonresponse.pm,v 1.70 2003/04/18 17:10:08 sakharuk Exp $
5: #
6: # Copyright Michigan State University Board of Trustees
7: #
8: # This file is part of the LearningOnline Network with CAPA (LON-CAPA).
9: #
10: # LON-CAPA is free software; you can redistribute it and/or modify
11: # it under the terms of the GNU General Public License as published by
12: # the Free Software Foundation; either version 2 of the License, or
13: # (at your option) any later version.
14: #
15: # LON-CAPA is distributed in the hope that it will be useful,
16: # but WITHOUT ANY WARRANTY; without even the implied warranty of
17: # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
18: # GNU General Public License for more details.
19: #
20: # You should have received a copy of the GNU General Public License
21: # along with LON-CAPA; if not, write to the Free Software
22: # Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
23: #
24: # /home/httpd/html/adm/gpl.txt
25: #
26: # http://www.lon-capa.org/
27: #
28: # 2/21 Guy
29:
30: package Apache::radiobuttonresponse;
31: use strict;
32: use HTML::Entities();
33:
34: BEGIN {
35: &Apache::lonxml::register('Apache::radiobuttonresponse',('radiobuttonresponse'));
36: }
37:
38: sub start_radiobuttonresponse {
39: my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
40: my $result;
41: #when in a radiobutton response use these
42: &Apache::lonxml::register('Apache::radiobuttonresponse',('foilgroup','foil','conceptgroup'));
43: push (@Apache::lonxml::namespace,'radiobuttonresponse');
44: my $id = &Apache::response::start_response($parstack,$safeeval);
45: %Apache::hint::radiobutton=();
46: if ($target eq 'meta') {
47: $result=&Apache::response::meta_package_write('radiobuttonresponse');
48: } elsif ($target eq 'edit' ) {
49: $result.=&Apache::edit::start_table($token).
50: '<tr><td>'.&Apache::lonxml::description($token)."</td><td>Delete:".
51: &Apache::edit::deletelist($target,$token)
52: ."</td><td> ".&Apache::edit::end_row()
53: .&Apache::edit::start_spanning_row();
54:
55: $result.=
56: &Apache::edit::text_arg('Max Number Of Shown Foils:','max',$token,'4').
57: &Apache::edit::select_arg('Randomize Foil Order','randomize',
58: ['yes','no'],$token).
59: &Apache::edit::end_row().&Apache::edit::start_spanning_row()."\n";
60: } elsif ($target eq 'modified') {
61: my $constructtag=&Apache::edit::get_new_args($token,$parstack,
62: $safeeval,'max','randomize');
63: if ($constructtag) { $result = &Apache::edit::rebuild_tag($token); }
64: } elsif ($target eq 'tex') {
65: my $type=&Apache::lonxml::get_param('TeXtype',$parstack,$safeeval,undef,0);
66: if ($type eq '1') {
67: $result .= ' \renewcommand{\labelenumi}{\arabic{enumi}.}';
68: } elsif ($type eq 'A') {
69: $result .= ' \renewcommand{\labelenumi}{\Alph{enumi}.}';
70: } elsif ($type eq 'a') {
71: $result .= ' \renewcommand{\labelenumi}{\alph{enumi}.}';
72: } elsif ($type eq 'i') {
73: $result .= ' \renewcommand{\labelenumi}{\roman{enumi}.}';
74: }
75: $result .= '\begin{enumerate}';
76: }
77: return $result;
78: }
79:
80: sub end_radiobuttonresponse {
81: my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
82: my $result;
83: if ($target eq 'edit') { $result=&Apache::edit::end_table(); }
84: if ($target eq 'tex') { $result .= '\end{enumerate}'; }
85: &Apache::response::end_response;
86: pop @Apache::lonxml::namespace;
87: &Apache::lonxml::deregister('Apache::radiobuttonresponse',('foilgroup','foil','conceptgroup'));
88: return $result;
89: }
90:
91: %Apache::response::foilgroup=();
92: sub start_foilgroup {
93: my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
94: my $result;
95: %Apache::response::foilgroup=();
96: $Apache::radiobuttonresponse::conceptgroup=0;
97: &Apache::response::setrandomnumber();
98: if ($target eq 'tex' && $Apache::lonhomework::type eq 'exam') {
99: $result.='\item[\textbf{'.$Apache::lonxml::counter.'}.]';
100: }
101: return $result;
102: }
103:
104: sub storesurvey {
105: if ( !defined($ENV{'form.submitted'})) { return ''; }
106: my $response = $ENV{'form.HWVAL_'.$Apache::inputtags::response['-1']};
107: &Apache::lonxml::debug("Here I am!:$response:");
108: if ( $response !~ /[0-9]+/) { return ''; }
109: my $id = $Apache::inputtags::response['-1'];
110: my @whichfoils=@{ $Apache::response::foilgroup{'names'} };
111: my %responsehash;
112: $responsehash{$whichfoils[$response]}=$response;
113: $Apache::lonhomework::results{"resource.$Apache::inputtags::part.$id.submission"}=&Apache::lonnet::hash2str(%responsehash);
114: $Apache::lonhomework::results{"resource.$Apache::inputtags::part.$id.awarddetail"}='SUBMITTED';
115: &Apache::lonxml::debug("submitted a $response<br />\n");
116: return '';
117: }
118:
119: sub grade_response {
120: my ($max,$randomize)=@_;
121: #keep the random numbers the same must always call this
122: my ($answer,@whichfoils)=&whichfoils($max,$randomize);
123: if (!defined($ENV{'form.submitted'})) { return; }
124: my $response;
125: if ($ENV{'form.submitted'} eq 'scantron') {
126: $response=&Apache::response::getresponse();
127: } else {
128: $response = $ENV{'form.HWVAL_'.$Apache::inputtags::response['-1']};
129: }
130: if ( $response !~ /[0-9]+/) { return; }
131: my $part=$Apache::inputtags::part;
132: my $id = $Apache::inputtags::response['-1'];
133: my %responsehash;
134: $responsehash{$whichfoils[$response]}=$response;
135: my $responsestr=&Apache::lonnet::hash2str(%responsehash);
136: my %previous=&Apache::response::check_for_previous($responsestr,
137: $part,$id);
138: $Apache::lonhomework::results{"resource.$part.$id.submission"}=
139: $responsestr;
140: &Apache::lonxml::debug("submitted a $response<br />\n");
141: my $ad;
142: if ($response == $answer) {
143: $ad='EXACT_ANS';
144: } else {
145: $ad='INCORRECT';
146: }
147: $Apache::lonhomework::results{"resource.$part.$id.awarddetail"}=$ad;
148: &Apache::response::handle_previous(\%previous,$ad);
149: }
150:
151: sub end_foilgroup {
152: my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
153:
154: my $result;
155: if ($target eq 'grade' || $target eq 'web' || $target eq 'answer' || $target eq 'tex') {
156: my $style = $Apache::lonhomework::type;
157: if ( $style eq 'survey' ) {
158: if ($target eq 'web' || $target eq 'answer' || $target eq 'tex') {
159: $result=&displayallfoils();
160: } elsif ( $target eq 'grade' ) {
161: $result=&storesurvey();
162: }
163: } else {
164: my $name;
165: my $max = &Apache::lonxml::get_param('max',$parstack,$safeeval,'-2');
166: my $randomize = &Apache::lonxml::get_param('randomize',$parstack,
167: $safeeval,'-2');
168: if ($target eq 'web' || $target eq 'tex') {
169: $result=&displayfoils($target,$max,$randomize);
170: } elsif ($target eq 'answer' ) {
171: $result=&displayanswers($max,$randomize);
172: } elsif ( $target eq 'grade') {
173: &grade_response($max,$randomize);
174: }
175: }
176: }
177: &Apache::lonxml::increment_counter();
178: return $result;
179: }
180:
181: sub getfoilcounts {
182: my @names;
183: my $truecnt=0;
184: my $falsecnt=0;
185: my $name;
186: if ( $Apache::response::foilgroup{'names'} ) {
187: @names= @{ $Apache::response::foilgroup{'names'} };
188: }
189: foreach $name (@names) {
190: if ($Apache::response::foilgroup{$name.'.value'} eq 'true') {
191: $truecnt++;
192: } elsif ($Apache::response::foilgroup{$name.'.value'} eq 'false') {
193: $falsecnt++;
194: }
195: }
196: return ($truecnt,$falsecnt);
197: }
198:
199: sub displayallfoils {
200: my $result;
201: &Apache::lonxml::debug("survey style display");
202: my @names = @{ $Apache::response::foilgroup{'names'} };
203: my $temp=0;
204: my $id=$Apache::inputtags::response['-1'];
205: my $part=$Apache::inputtags::part;
206: my $lastresponse=$Apache::lonhomework::history{"resource.$part.$id.submission"};
207: my %lastresponse=&Apache::lonnet::str2hash($lastresponse);
208: if (($Apache::lonhomework::history{"resource.$part.solved"} =~ /^correct/) || ($Apache::inputtags::status[-1] eq 'SHOW_ANSWER')) {
209: foreach my $name (@names) {
210: if ($Apache::response::foilgroup{$name.'.value'} ne 'unused') {
211: $result.="<br />".$Apache::response::foilgroup{$name.'.value'};
212: if ($Apache::response::foilgroup{$name.'.value'} eq 'true') {
213: $result.='<b>';
214: }
215: $result .= $Apache::response::foilgroup{$name.'.text'};
216: if ($Apache::response::foilgroup{$name.'.value'} eq 'true') {
217: $result.='</b>';
218: }
219: }
220: }
221: } else {
222: foreach my $name (@names) {
223: if ($Apache::response::foilgroup{$name.'.value'} ne 'unused') {
224: $result.="<br /><input type=\"radio\" name=\"HWVAL_$Apache::inputtags::response['-1']\" value=\"$temp\" ";
225: if (defined($lastresponse{$name})) { $result .= 'checked="on"'; }
226: $result .= '>'.$Apache::response::foilgroup{$name.'.text'}."</input>\n";
227: $temp++;
228: }
229: }
230: }
231: return $result;
232: }
233:
234: sub whichfoils {
235: my ($max,$randomize)=@_;
236:
237: my @truelist;
238: my @falselist;
239: my @whichfalse =();
240: my ($truecnt,$falsecnt) = &getfoilcounts();
241: my $count=0;
242: # we will add in 1 of the true statements
243: if (($falsecnt+1)>$max) { $count=$max } else { $count=$falsecnt+1; }
244: my $answer=int(&Math::Random::random_uniform() * ($count));
245: &Apache::lonxml::debug("Count is $count, $answer is $answer");
246: my @names;
247: if ( $Apache::response::foilgroup{'names'} ) {
248: @names= @{ $Apache::response::foilgroup{'names'} };
249: }
250: if (&Apache::response::showallfoils()) {
251: @whichfalse=@names;
252: } elsif ($randomize eq 'no') {
253: &Apache::lonxml::debug("No randomization");
254: my $havetrue=0;
255: foreach my $name (@names) {
256: if ($Apache::response::foilgroup{$name.'.value'} eq 'true') {
257: if (!$havetrue ) {
258: push(@whichfalse,$name); $havetrue++; $answer=$#whichfalse;
259: }
260: } elsif ($Apache::response::foilgroup{$name.'.value'} eq 'false') {
261: push (@whichfalse,$name);
262: } elsif ($Apache::response::foilgroup{$name.'.value'} eq 'unused') {
263: } else {
264: &Apache::lonxml::error(&HTML::Entities::encode("No valid value assigned ($Apache::response::foilgroup{$name.'.value'}) for foil $name in <foilgroup>"));
265: }
266: }
267: } else {
268: my $current=0;
269: &Apache::lonhomework::showhash(%Apache::response::foilgroup);
270: my (%top,%bottom);
271: #first find out where everyone wants to be
272: foreach my $name (@names) {
273: $current++;
274: if ($Apache::response::foilgroup{$name.'.value'} eq 'true') {
275: push (@truelist,$name);
276: if ($Apache::response::foilgroup{$name.'.location'} eq 'top') {
277: $top{$name}=$current;
278: } elsif ($Apache::response::foilgroup{$name.'.location'} eq 'bottom') {
279: $bottom{$name}=$current;
280: }
281: } elsif ($Apache::response::foilgroup{$name.'.value'} eq 'false') {
282: push (@falselist,$name);
283: if ($Apache::response::foilgroup{$name.'.location'} eq 'top') {
284: $top{$name}=$current;
285: } elsif ($Apache::response::foilgroup{$name.'.location'} eq 'bottom') {
286: $bottom{$name}=$current;
287: }
288: } elsif ($Apache::response::foilgroup{$name.'.value'} eq 'unused') {
289: } else {
290: &Apache::lonxml::error(&HTML::Entities::encode("No valid value assigned ($Apache::response::foilgroup{$name.'.value'}) for foil $name in <foilgroup>"));
291: }
292: }
293: #pick a true statement
294: my $whichtrue = int(&Math::Random::random_uniform() * ($#truelist+1));
295: &Apache::lonxml::debug("Max is $max, From $#truelist elms, picking $whichtrue");
296: my (@toplist, @bottomlist);
297: my $topcount=0;
298: # assign everyone to either toplist/bottomlist or whichfalse
299: # which false is randomized, toplist bottomlist are in order
300: while ((($#whichfalse) < $max-2) && ($#falselist > -1)) {
301: &Apache::lonxml::debug("Have $#whichfalse max is $max");
302: my $afalse=int(&Math::Random::random_uniform() * ($#falselist+1));
303: &Apache::lonxml::debug("From $#falselist elms, picking $afalse");
304: $afalse=splice(@falselist,$afalse,1);
305: &Apache::lonxml::debug("Picked $afalse");
306: &Apache::lonhomework::showhash(('names'=>\@names));
307: &Apache::lonhomework::showhash(%top);
308: if ($top{$afalse}) {
309: $toplist[$top{$afalse}]=$afalse;
310: $topcount++;
311: } elsif ($bottom{$afalse}) {
312: $bottomlist[$bottom{$afalse}]=$afalse;
313: } else {
314: push (@whichfalse,$afalse);
315: }
316: }
317: my $truename=$truelist[$whichtrue];
318: my $dosplice=1;
319: #insert the true statement, keeping track of where it wants to be
320: if ($Apache::response::foilgroup{$truename.'.location'} eq 'top' ) {
321: $toplist[$top{$truename}]=$truename;
322: $answer=-1;
323: foreach my $top (reverse(@toplist)) {
324: if ($top) { $answer++;}
325: if ($top eq $truename) { last; }
326: }
327: $dosplice=0;
328: } elsif ($Apache::response::foilgroup{$truename.'.location'} eq 'bottom') {
329: $bottomlist[$bottom{$truename}]=$truename;
330: $answer=-1;
331: foreach my $bot (@bottomlist) {
332: if ($bot) { $answer++;}
333: if ($bot eq $truename) { last; }
334: }
335: $answer+=$topcount+$#whichfalse+1;
336: $dosplice=0;
337: } else {
338: if ($topcount>0) {
339: $answer = int(&Math::Random::random_uniform() * ($#whichfalse+1))
340: + $topcount;
341: }
342: }
343: #add the top items to the top, bottom items to the bottom
344: for (my $i=0;$i<=$#toplist;$i++) {
345: if ($toplist[$i]) { unshift(@whichfalse,$toplist[$i]) }
346: }
347: for (my $i=0;$i<=$#bottomlist;$i++) {
348: if ($bottomlist[$i]) { push(@whichfalse,$bottomlist[$i]) }
349: }
350: #if the true statement is randomized insert it into the list
351: if ($dosplice) { splice(@whichfalse,$answer,0,$truelist[$whichtrue]); }
352: }
353: &Apache::lonxml::debug("Answer is $answer");
354: return ($answer,@whichfalse);
355: }
356:
357: sub displayfoils {
358: my ($target,$max,$randomize)=@_;
359: my $result;
360:
361: my ($answer,@whichfoils)=&whichfoils($max,$randomize);
362: my $part=$Apache::inputtags::part;
363: my $solved=$Apache::lonhomework::history{"resource.$part.solved"};
364: my $status=$Apache::inputtags::status[-1];
365: if ( ($target ne 'tex') &&
366: (($solved =~ /^correct/) || ($status eq 'SHOW_ANSWER')) ) {
367: foreach my $name (@whichfoils) {
368: if ($target ne 'tex') {
369: $result.="<br />";
370: } else {
371: $result.='\item \vskip -2 mm ';
372: }
373: if ($Apache::response::foilgroup{$name.'.value'} eq 'true') {
374: if ($target ne 'tex') { $result.='Correct:<b>'; } else { $result.='Correct: \textbf{';}
375: } else {
376: $result.='Incorrect:';
377: }
378: if ($target ne 'tex') {
379: $result.=$Apache::response::foilgroup{$name.'.text'}."</input>\n";
380: } else {
381: $result.=$Apache::response::foilgroup{$name.'.text'};
382: }
383: if ($Apache::response::foilgroup{$name.'.value'} eq 'true') {
384: if ($target ne 'tex') { $result.='</b>';} else {$result.='}';}
385: }
386: }
387: } else {
388: my @alphabet = ('A'..'Z');
389: my $i = 0;
390: my $temp=0;
391: my $id=$Apache::inputtags::response['-1'];
392: my $part=$Apache::inputtags::part;
393: my $lastresponse=$Apache::lonhomework::history{"resource.$part.$id.submission"};
394: my %lastresponse=&Apache::lonnet::str2hash($lastresponse);
395: foreach my $name (@whichfoils) {
396: if ($target ne 'tex') {
397: $result.="<br /><input type=\"radio\" name=\"HWVAL_$Apache::inputtags::response['-1']\" value=\"$temp\" ";
398: if (defined($lastresponse{$name})) { $result .= 'checked="on"'; }
399: $result .= '>'.$Apache::response::foilgroup{$name.'.text'}."</input>\n";
400: } else {
401: if ($Apache::lonhomework::type eq 'exam') {
402: $result .= '{\small \textbf{'.$alphabet[$i].'}}$\bigcirc$'.$Apache::response::foilgroup{$name.'.text'}.'\\\\'; #' stupid emacs
403: $i++;
404: } else {
405: $result .= '\vspace*{-2 mm}\item '.$Apache::response::foilgroup{$name.'.text'};
406: }
407: }
408: $temp++;
409: }
410: }
411: if ($target ne 'tex') { $result.="<br />"; } else { $result.='\vskip 0 mm '; }
412: return $result;
413: }
414:
415: sub displayanswers {
416: my ($max,$randomize)=@_;
417: my ($answer,@whichopt) = &whichfoils($max,$randomize);
418: my $result=&Apache::response::answer_header('radiobuttonresponse');
419: foreach my $name (@whichopt) {
420: $result.=&Apache::response::answer_part('radiobuttonresponse',
421: $Apache::response::foilgroup{$name.'.value'})
422: }
423: $result.=&Apache::response::answer_footer('radiobuttonresponse');
424: return $result;
425: }
426:
427: sub start_conceptgroup {
428: my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
429: $Apache::radiobuttonresponse::conceptgroup=1;
430: %Apache::response::conceptgroup=();
431: my $result;
432: if ($target eq 'edit') {
433: $result.=&Apache::edit::tag_start($target,$token);
434: $result.=&Apache::edit::text_arg('Concept:','concept',$token,'50').
435: &Apache::edit::end_row().&Apache::edit::start_spanning_row();
436: } elsif ($target eq 'modified') {
437: my $constructtag=&Apache::edit::get_new_args($token,$parstack,
438: $safeeval,'concept');
439: if ($constructtag) { $result = &Apache::edit::rebuild_tag($token); }
440: }
441: return $result;
442: }
443:
444: sub end_conceptgroup {
445: my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
446: $Apache::radiobuttonresponse::conceptgroup=0;
447: my $result;
448: if ($target eq 'web' || $target eq 'grade' || $target eq 'answer' || $target eq 'tex') {
449: if (defined(@{ $Apache::response::conceptgroup{'names'} })) {
450: my @names = @{ $Apache::response::conceptgroup{'names'} };
451: my $pick=int(&Math::Random::random_uniform() * ($#names+1));
452: my $name=$names[$pick];
453: push @{ $Apache::response::foilgroup{'names'} }, $name;
454: $Apache::response::foilgroup{"$name.text"} = $Apache::response::conceptgroup{"$name.text"};
455: $Apache::response::foilgroup{"$name.value"} = $Apache::response::conceptgroup{"$name.value"};
456: $Apache::response::foilgroup{"$name.location"} = $Apache::response::conceptgroup{"$name.location"};
457: my $concept = &Apache::lonxml::get_param('concept',$parstack,$safeeval);
458: $Apache::response::foilgroup{"$name.concept"} = $concept;
459: &Apache::lonxml::debug("Selecting $name in $concept");
460: my $part_id="$Apache::inputtags::part.$Apache::inputtags::response[-1]";
461: push(@{ $Apache::hint::radiobutton{"$part_id.concepts"} },$concept);
462: $Apache::hint::radiobutton{"$part_id.concept.$concept"}=
463: $Apache::response::conceptgroup{'names'};
464: }
465: } elsif ($target eq 'edit') {
466: $result=&Apache::edit::end_table();
467: }
468: return $result;
469: }
470:
471: sub insert_conceptgroup {
472: my $result="\n\t\t<conceptgroup concept=\"\">".&insert_foil()."\n\t\t</conceptgroup>\n";
473: return $result;
474: }
475:
476: sub start_foil {
477: my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
478: my $result='';
479: if ($target eq 'web' || $target eq 'tex') {
480: &Apache::lonxml::startredirection;
481: } elsif ($target eq 'edit') {
482: $result=&Apache::edit::tag_start($target,$token);
483: $result.=&Apache::edit::text_arg('Name:','name',$token);
484: $result.=&Apache::edit::select_or_text_arg('Correct Option:','value',
485: ['unused','true','false'],$token);
486: my $randomize=&Apache::lonxml::get_param('randomize',$parstack,
487: $safeeval,'-3');
488: if ($randomize ne 'no') {
489: $result.=&Apache::edit::select_arg('Location:','location',
490: ['random','top','bottom'],$token);
491: }
492: $result.=&Apache::edit::end_row().&Apache::edit::start_spanning_row();
493: } elsif ($target eq 'modified') {
494: my $constructtag=&Apache::edit::get_new_args($token,$parstack,$safeeval,
495: 'value','name','location');
496: if ($constructtag) { $result = &Apache::edit::rebuild_tag($token); }
497: }
498: return $result;
499: }
500:
501: sub end_foil {
502: my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
503: my $text='';
504: if ($target eq 'web' || $target eq 'tex') { $text=&Apache::lonxml::endredirection; }
505: if ($target eq 'web' || $target eq 'grade' || $target eq 'answer' || $target eq 'tex') {
506: my $value = &Apache::lonxml::get_param('value',$parstack,$safeeval);
507: if ($value ne 'unused') {
508: my $name = &Apache::lonxml::get_param('name',$parstack,$safeeval);
509: my $location =&Apache::lonxml::get_param('location',$parstack,$safeeval);
510: if (!$name) { $name=$Apache::lonxml::curdepth; }
511: if ( $Apache::radiobuttonresponse::conceptgroup
512: && !&Apache::response::showallfoils() ) {
513: push @{ $Apache::response::conceptgroup{'names'} }, $name;
514: $Apache::response::conceptgroup{"$name.value"} = $value;
515: $Apache::response::conceptgroup{"$name.text"} = $text;
516: $Apache::response::conceptgroup{"$name.location"} = $location;
517: } else {
518: push @{ $Apache::response::foilgroup{'names'} }, $name;
519: $Apache::response::foilgroup{"$name.value"} = $value;
520: $Apache::response::foilgroup{"$name.text"} = $text;
521: $Apache::response::foilgroup{"$name.location"} = $location;
522: }
523: }
524: }
525: return '';
526: }
527:
528: sub insert_foil {
529: return '
530: <foil name="" value="unused">
531: <startouttext />
532: <endouttext />
533: </foil>';
534: }
535: 1;
536: __END__
537:
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