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[
  { Var1 => Value1, Var2 => Value2 },
  { Var1 => Value3, Var2 => Value4 }
]

[ [vertex_1_id, undef], ...., [vertex_n_id, undef] ]

$pg->add_fact( gnarfle => qw/ foo bar baz / );
$pg->add_fact( gnarfle => qw/ foo tac toe / );
$pg->add_fact( gnarfle => qw/ tic tac toe / );

$data = $pg->gnarfle( qw/ $one tac $three / )

[
  [ [7, undef], [2, undef] ],            ' $one
...
          ^           ^
  [ [6,   |  ], [6,   |  ] ]             ' $three
]

[
  { $one => 'foo', $three => 'toe' },
  { $one => 'tic', $three => 'toe' }
]