Sometimes yes. Sometimes no. I think the programming is off. On the item before, i did not use ka for either fruit and it was accepted. This time I omitted ka for strawberry but included for blueberry and got dinged for the missing ka.
i tripped up on reversing the a and i. "ka ʻōhelo papa i a ʻole ka pīʻai" instead of ka ʻōhelo papa a i ʻole ka pīʻai which is the answer for this question. how does this fundamentally change the meaning, serious question.