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$pg->add_fact( owns => ('Ovid', 'Cheap Whiskey'));
[0]{2}[1]{3} = {} [1]{3} = {}
# object ids are hashes and argument positions are arrays $self->{_arg_levels}{2}[0]{2}[1]{3};
$_ = $self->_get_vertex( $_ ) foreach @args; ... $a = $z; } return 1;
$pg->add_fact( gnarfle => qw/ foo bar baz / ); $pg->add_fact( gnarfle => qw/ foo tac toe / ); ... my $results = gnarfle( qw/ $one _ $two / ); # or my $results = gnarfle( qw/ $one tac $two / );
foo baz foo toe tic toe
foo toe tic toe
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