- High tide is a stage in the tide cycle process
- Low tide is a stage in the tide cycle process
- The tide cycle occurs regularly twice per day
- So, high tide and low tide in the tide cycle occur twice per day

- High tide and low tide in the tide cycle occur twice per day
- A tide is a kind of natural event
- So, high tide and low tide in the tidy cycle are the natural event that occur twice per day

So, high tide and low tide in the tidy cycle are the natural event that occur twice per day
Question: Which of these natural events occurs at time intervals that are the most regular?
Context: - High tide is a stage in the tide cycle process 
- A tide is a kind of natural event 
- Low tide is a stage in the tide cycle process 
- The tide cycle occurs regularly twice per day