$\snippet{name: op_column, sign: '+', x: '15', y: '47', z: '62 '}$
 
$\snippet{name: op_column, sign: '-', x: '64', y: '47', z: '17 '}$
 
$\snippet{name: op_column, sign: '-', x: '64', y: '25', z: '39 '}$
 
$\snippet{name: op_column, sign: '+', x: '48', y: '43', z: '91 '}$
 
$\snippet{name: op_column, sign: '+', x: '28', y: '45', z: '73 '}$
 
$\snippet{name: op_column, sign: '-', x: '61', y: '37', z: '24 '}$
 
$\snippet{name: op_column, sign: '-', x: '72', y: '59', z: '13 '}$