Conditional Sequencing Diagramming Drill #5

[sdb606]

Is there possibly an error in the answer for drill q 5? The book says the only possible sequences for K, L, M are

both K,L before M
or
both K,L after M

But what about M-K-L? This sequence fulfills the second clause which says M-L is allowed.

[KelseyWoods]

Hi sdb606!

M K L falls under the option that states both K and L could be after M.

Based on the rule, we can have K M or M L but not both. That means that both K and L could be before M or both K and L could be after M. But we don't know the relationship between K and L in either of these scenarios--that's why they are depicted as double-branched sequencing rules with no direct link between K and L.

So if they are both before M, it could be
K L M or L K M

And if they are both after M it could be
M K L or M L K.

Instead of writing out all four of these sequencing options, it is more efficient to just write out the two options which show that we don't know the relationship between K and L so either one could be before or after the other.

Hope this helps!

Best,
Kelsey