Curious to hear other takes, but I think no in this narrow view. The point is just context in the initial argument, but it stands to preempt or refute a theoretical future counterargument.

#feedback Maybe this will get someone from 7Sage involved? Sorry if this doesn't rise to the level of important feedback.

I've come to the conclusion that this is not a premise in this case based on how it's used, but we are asked to make a separate assumption about zebra stripiness.

#help In the table setting example, couldn't we drill in and describe the line "zebras have black and white stripes" as a premise? I know it's pedantic, but thinking back to the tigers-as-pets example in which we explored what would happen to the argument of the premise that tigers are mammals broke down, wouldn't a similar logic apply to the zebra line? If zebras did NOT have stripes in our fantasy world (see the similarly fantastical reptilian tigers), the argument that zebras have stripes to deter flies from landing seems laughable.