edit: SORRY FOR THE TYPO

Hello,

Hidden autofills appear too complicated for me, so how about a recode like below? How could one go about getting a new variable/column in your data set based on the following:

QS2a - multiple choice
a) Apple
b) Banana
c) Coconut
d) Dragonfruit

QS2b - single choice (and only shown if multiple answers at QS2a)
a) Apple
b) Banana
c) Coconut
d) Dragonfruit

I want a recode (call it RQS2b) where
(QS2a = Apple AND QS2b = blank) OR QS2b = Apple, then RQS2b = Apple
(QS2a = Banana AND QS2b = blank) OR QS2b = Banana, then RQS2b = Banana
(QS2a = Coconut AND QS2b = blank) OR QS2b = Coconut, then RQS2b = Coconut
(QS2a = Dragonfruit AND QS2b = blank) OR QS2b = Dragonfruit, then RQS2b = Dragonfruit

Please please help if you can. QS2a and QS2b exist in my survey, but RQS2b is just theoretical and what I want to create.