UMLR — Continuation examples are missing InteractionConstraints for the Alternative CombinedFragment

In Figure 17.15 an example of a sequence diagram continuation is given. To make sense of this example, the interaction constraints for the alt operands should be shown. Without the constraints being shown, the two operands are both considered true.
In Figure 17.16, the continuation is "rolled out", but the interaction constraints are still missing.

To fix, in Figure 17.15, add the interaction constraints of "True" on the first of the alt operands (in both left and right diagrams), and add the the constraint of Else (or False) on the lower operands.

In Figure 17.16 apply the interaction constraints in the same manner.