When Realizeit detects multiple sections of the same type, it will assume they are alternatives of each other. Then it will choose one or the other initially for the learner and offer the additional versions on completion of the first choice.
If both sections should be delivered, enabling the Part of main path option in the section properties for both sections will deliver both sections in the lesson path. (This might be the case, for example, where the author has split the learning content into two sections for aesthetic reasons or organizational purposes.)
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