Commas are mostly optional and whitespace is also mostly optional. You need one or the other in some cases to say when something ends and the next thing begins i.e. so that 1,1 or 1 1 is not parsed as 11.
You can put a single comma between any two numbers so A, 30 50 0 0 1 162.55 162.45 is invalid as is A 30,, 50 0 0 1 162.55 162.45