Which of these criteria CANNOT be used to create a Custom Segment?
Sequences of user actions
he segment builder lets you create the component filters of a segment based on Analytics dimensions and metrics. You choose a dimension or metric, a comparative operator, and you enter a value to set the condition for the filter. In many cases, you can also choose the scope of the data (hit, session, user).
Read more here: https://support.google.com/analytics/answer/3124493