            if (block.timestamp - startedAt <= GRACE_PERIOD_TIME) { 
                revert Errors.GRACE_PERIOD_NOT_OVER();
            }
            if (answer == 1) {
                // sequencer is down
                revert Errors.SEQUENCER_DOWN();
            }

            if (block.timestamp - startedAt <= GRACE_PERIOD_TIME) {
                // time since up
                revert Errors.GRACE_PERIOD_NOT_OVER();
            }
