not equal in rule engine

Hi there

how can i add an operator which means NOT EQUAL to a value not to a column?

e.g. i want to say $column A$ =/ “11” OR $column A$ =/ “10” => “Ko”

$column A$ = “11” OR $columnA$ = “10” => “Ok”

the function NOT $column A$ = “11”… seems it doesn’t work

thanks in advance