$\snippet{name: op_column, sign: '+', x: 15, y: 76, z: 91}$
Проверка:
$\snippet{name: op_column, sign: '-', x: 91, y: 76, z: 15}$
 
$\snippet{name: op_column, sign: '-', x: 93, y: 38, z: 55}$
Проверка:
$\snippet{name: op_column, sign: '+', x: 55, y: 38, z: 93}$
 
$\snippet{name: op_column, sign: '+', x: 47, y: 29, z: 76}$
Проверка:
$\snippet{name: op_column, sign: '-', x: 76, y: 29, z: 47}$
 
$\snippet{name: op_column, sign: '-', x: 71, y: 56, z: 15}$
Проверка:
$\snippet{name: op_column, sign: '+', x: 15, y: 56, z: 71}$