$\snippet{name: op_column, sign: '-', x: '65', y: '13', z: '52'}$
 
$\snippet{name: op_column, sign: '+', x: '65', y: '13', z: '78'}$
 
$\snippet{name: op_column, sign: '+', x: '58', y: '19', z: '77'}$
 
$\snippet{name: op_column, sign: '+', x: '35', y: '15', z: '50'}$