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