Question: How to use 'alias'

Hello there, 

Would you allow me to a question regarding the correct way of using 'alias?

In the attached worksheet, an alias is defined, then a. the defined alias is not working (please have a look at the line with the same comment), b. the alias works in the other way around (please have a look at the line with the corresponding comment, Alias is working backward). When I tried to substitute the function with the 'subs' command (please have a look at the expression 'Desired'), then I was able to get the result, expected from alias command. 

Perhaps, I am confused with how the 'alias' command works. I would appreciate it if the correct way is explained. 

Thank you, 

In Kwon Park 

Maple Worksheet - Error

Failed to load the worksheet /maplenet/convert/Q20210724.mw .
 

Download Q20210724.mw