$\snippet{name: op_column, sign: '+', x: '48', y: '32', z: ''}$
$\snippet{name: op_column, sign: '+', x: '56', y: '24', z: ''}$
$\snippet{name: op_column, sign: '+', x: '38', y: '42', z: ''}$
$\snippet{name: op_column, sign: '-', x: '58', y: '32', z: ''}$
$\snippet{name: op_column, sign: '-', x: '67', y: '13', z: ''}$

$\snippet{name: op_column, sign: '+', x: '48', y: '32', z: '80'}$
$\snippet{name: op_column, sign: '+', x: '56', y: '24', z: '80'}$
$\snippet{name: op_column, sign: '+', x: '38', y: '42', z: '80'}$
$\snippet{name: op_column, sign: '-', x: '58', y: '32', z: '26'}$
$\snippet{name: op_column, sign: '-', x: '67', y: '13', z: '54'}$