It’s easier to figure out the result of chained Boolean comparisons (in Bubble) than you are making it.
Here’s the general form of a Boolean comparison:
1 B 2
Where 1 and 2 are Boolean expressions and B is a Boolean operator (AND or OR in Bubble).
Let’s say that the result of 1 B 2 is represented by “12” (meaning the result of the comparison of “1” and “2”).
Now let’s look at a chain of such comparisons:
1 B 2 B 3 B 4 B 5
We just evaluate them left to right, each evaluation collapses the leftmost comparison, so we start as above, but step by step we get:
12 B 3 B 4 B 5
123 B 4 B 5
1234 B 5
12345
So:
AB AND C OR D
ABC OR D
ABCD