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package WWW::Link::Tester; |
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$REVISION=q$Revision: 1.14 $ ; $VERSION = sprintf ( "%d.%02d", $REVISION =~ /(\d+).(\d+)/ ); |
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=head1 NAME |
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WWW::Link::Tester - base class for link testers. |
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=head1 SYNOPSIS |
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use WWW::Link::Tester |
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$ua=create_a_user_agent(); |
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my $tester = new WWW::Link::Tester, $ua; |
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$link=get_a_link_object(); |
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$tester->test_link($link); |
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=head1 DESCRIPTION |
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This class acts as a base for constructing link testing classes. It |
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provides methods that are useful within those classes. |
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=cut |
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83440
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use URI; |
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use Carp; |
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use Exporter; |
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@ISA=qw(Exporter); |
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@EXPORT=qw(RC_PROTOCOL_UNSUPPORTED MSG_PROTOCOL_UNSUPPORTED RC_REDIRECT_LIMIT_EXCEEDED MSG_REDIRECT_LIMIT_EXCEEDED); |
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use strict; |
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use warnings; |
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use HTTP::Status; |
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sub MSG_PROTOCOL_UNSUPPORTED () {"Unsupported protocol";} |
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sub RC_PROTOCOL_UNSUPPORTED () {498;} |
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sub MSG_REDIRECT_LIMIT_EXCEEDED () {"Too Many Redirects";} |
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sub RC_REDIRECT_LIMIT_EXCEEDED () {499;} |
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sub new { |
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0
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my $proto = shift; |
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1
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my $class = ref($proto) || $proto; |
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my $self = {}; |
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$self->{"user_agent"}=shift; |
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bless $self, $class; |
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$self->config(); |
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return $self; |
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} |
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sub test_link { |
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my $self=shift; |
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my $link=shift; |
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my ($response, @redirects) = $self->get_response($link); |
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$self->handle_response($link,$response,@redirects); |
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} |
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sub get_response { |
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0
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0
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confess "get_response must be implemented in the child class"; |
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} |
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sub verbose { |
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my $self=shift; |
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my $verb=shift; |
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$self->{verbose} = $verb if defined $verb; |
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return $self->{verbose}; |
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} |
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=head2 handle_response |
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handle_response is normally just the same as apply response. The |
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extra level of indirection can be used where some responses aren't |
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meant to directly affect the link. |
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=cut |
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sub handle_response { |
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my $self=shift; |
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my $link=shift; |
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my $response=shift; |
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my @redirects=@_; |
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$self->apply_response($link, $response, @redirects); |
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my $now=time; |
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$link->store_response($response,$now, ref $self); |
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} |
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=head2 apply_response |
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We have a response which should be used to affect the state of the |
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link. This should only be called at the end of a chain of redirects, |
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not for each member in the chain. |
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=cut |
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sub apply_response { |
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1
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my $self=shift; |
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my $link=shift; |
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my $response=shift; |
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my @redirects=@_; |
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149
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my $verbose=$self->{"verbose"}; |
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100
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my $mode=$self->{mode}; |
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102
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confess "response wasn't an object" unless ref $response; |
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50
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127
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confess "non numeric response code" . $response->code() unless |
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$response->code() =~ m/[1-9][0-9]+/; |
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CASE: { |
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100
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497
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robot_lockout($response) && do { |
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107
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107
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3
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print STDERR "checking disallowed, signalling link\n" |
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if $::verbose; |
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3
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14
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$link->disallowed(); |
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3
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last; |
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}; |
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43
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100
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617
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unsupported($response) && do { |
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165
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print STDERR "checking disallowed, signalling link\n" |
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if $::verbose; |
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14
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52
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$link->unsupported(); |
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last; |
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}; |
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100
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$response->is_error() && do { |
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print STDERR "response was an error, signalling link\n" |
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if $::verbose; |
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88
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$link->failed_test(); #someone should come look |
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22
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last; |
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}; |
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12
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50
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115
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$response->is_success() && do { |
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90
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print STDERR "response was success, signalling link\n" |
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if $::verbose; |
127
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12
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40
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$link->passed_test(); |
128
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12
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91
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last; |
129
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}; |
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#a redirect should eiter be terminiated with a success or should be |
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#treated as a failure if we don't find the end of a chain of |
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#redirects. |
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0
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0
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0
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$response->is_redirect() && |
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die "Redirects shouldn't get through to here\n"; |
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0
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0
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$self->ambiguous_test($link); |
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} |
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100
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253
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@redirects ? $link->found_redirected() : $link->not_redirected(); |
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100
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160
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$link->redirects( \@redirects ) if @redirects; |
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} |
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141
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sub config { |
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5
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5
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0
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shift->{"max_redirects"}=15; |
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} |
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145
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sub robot_lockout { |
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0
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my $response=shift; |
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100
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109
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$response->code() == RC_FORBIDDEN or return 0; |
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3
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31
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my $message = $response->message(); |
149
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#FIXME; this is because the Complex tester looses this informaition! |
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3
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100
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29
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defined $message or return 1; |
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2
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50
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163
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$message=~ /robots\.txt/ and return 1; |
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0
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0
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return 0; |
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} |
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155
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sub unsupported { |
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0
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my $response=shift; |
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109
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$response->code() == RC_PROTOCOL_UNSUPPORTED |
158
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and return 1; |
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160
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#I'm not sure I like the following special case. |
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162
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$response->code == 400 and |
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$response-> message =~ m/Library does not allow method/ |
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and return 1; |
165
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166
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29
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266
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return 0; |
167
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} |
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169
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1; #kEEp rEqUIrE HaPpY. |