Inkjet printer and nonvolatile memory storing computer program

An inkjet printer comprising:

• a first ink head including:
• a first sub-head that includes a first nozzle to discharge first ink;
• a second sub-head that includes a second nozzle to discharge second ink different from the first ink;
• and
• a nozzle surface provided with the first nozzle and the second nozzle;
• a second ink head including:
• a third sub-head that includes a third nozzle to discharge third ink;
• and
• a fourth sub-head that includes a fourth nozzle to discharge fourth ink;
• an ink collector to collect the ink discharged from the first ink head;
• an intermittent flushing controller to perform an intermittent flushing operation for at least the first sub-head, the intermittent flushing operation involving repeating a first operation and a second operation for a predetermined number of iterations, the first operation involving discharging the first ink into the ink collector from the first nozzle a predetermined number of times, the second operation involving being on standby for a predetermined time without discharging the first ink from the first nozzle;
• and
• a successive flushing controller to perform a successive flushing operation that involves discharging the first ink, the second ink, the third ink, and the fourth ink from the first nozzle, the second nozzle, the third nozzle, and the fourth nozzle, respectively, in succession, wherein
• the intermittent flushing controller does not perform the intermittent flushing operation for at least one of the second sub-head, the third sub-head, and the fourth sub-head, and
• the successive flushing controller performs the successive flushing operation for all of the first, second, third, and fourth sub-heads after the intermittent flushing controller has performed the intermittent flushing operation for the first sub-head.