$\snippet{name: op_column, sign: '+', x: '746', y: '238', z: ' '}$
$\snippet{name: op_column, sign: '+', x: '457', y: '189', z: ' '}$
$\snippet{name: op_column, sign: '-', x: '634', y: '425', z: ' '}$
$\snippet{name: op_column, sign: '-', x: '583', y: '348', z: ' '}$
$\snippet{name: op_column, sign: '+', x: '746', y: '238', z: '984 '}$
$\snippet{name: op_column, sign: '+', x: '457', y: '189', z: '646 '}$
$\snippet{name: op_column, sign: '-', x: '634', y: '425', z: '209 '}$
$\snippet{name: op_column, sign: '-', x: '583', y: '348', z: '235 '}$