Here is an example syntax diagram that describes the hello command:
Hello Command >>-hello--+----------+--+--------------+----------------------->< '-| Name |-' '-| Greeting |-' Name .-,----------. V (1) | |---- name------+-----------------------------------------------| Greeting |--, how are you?-----------------------------------------------|
According to the syntax diagram, these are all valid versions of the hello command:
hello hello name hello name, name hello name, name, name hello, how are you? hello name, how are you? hello name, name, how are you? hello name, name, name, how are you?
The space before the name value is significant, and that if you do not code name at all, you must still code the comma before how are you?.
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