Draw a BPMN process for making tea with gateways and optimize it.

The tea brewing process in BPMN can be represented as follows:

1. Start
2. Fill the kettle with water
3. Turn on the kettle
4. Wait for the water to boil (gateway: has the water boiled?)
   • If no, wait
   • If yes, proceed to the next step
5. Put the tea bag into the cup
6. Pour boiling water into the cup
7. Steep the tea (gateway: is it steeped enough?)
   • If no, wait
   • If yes, proceed to the next step
8. Add sugar/milk if desired (gateway: add?)
   • If yes, add
   • If no, skip
9. Stir the tea
10. End

Optimization:

• Combine "Put the tea bag" and "Pour boiling water" steps if it does not affect quality.
• Eliminate unnecessary waiting, for example, if the kettle has an auto-shutdown feature, manual boiling check can be skipped.
• Use parallel gateways if the cup and kettle can be prepared simultaneously.

Example of an optimized process:

Start -> Fill the kettle with water and put the tea bag into the cup (parallel) -> Turn on the kettle -> Wait for boiling -> Pour boiling water -> Steep -> Add sugar/milk if needed -> Stir -> End