$\snippet{name: op_column, sign: '+', x: '484', y: '165', z: '649'}$
 
$\snippet{name: op_column, sign: '+', x: '529', y: '321', z: '850'}$
 
$\snippet{name: op_column, sign: '+', x: '840', y: '102', z: '942'}$
 
$\snippet{name: op_column, sign: '+', x: '209', y: '197', z: '406'}$
 
$\snippet{name: op_column, sign: '-', x: '806', y: '724', z: '82'}$
 
$\snippet{name: op_column, sign: '-', x: '356', y: '186', z: '170'}$
 
$\snippet{name: op_column, sign: '-', x: '670', y: '263', z: '407'}$
 
$\snippet{name: op_column, sign: '-', x: '122', y: '122', z: '0'}$